Bump rack-session from 2.0.0 to 2.1.0 in /spec/tester_mongo (#1118)

Bumps [rack-session](https://github.com/rack/rack-session) from 2.0.0 to
2.1.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/rack/rack-session/releases">rack-session's
releases</a>.</em></p>
<blockquote>
<h2>v2.1.0</h2>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/rack/rack-session/compare/v2.0.0...v2.1.0">https://github.com/rack/rack-session/compare/v2.0.0...v2.1.0</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rack/rack-session/blob/v2.1.0/releases.md">rack-session's
changelog</a>.</em></p>
<blockquote>
<h2>v2.1.0</h2>
<ul>
<li>Improved compatibility with Ruby 3.3+ and Rack 3+.</li>
<li>Add support for cookie option <code>partitioned</code>.</li>
<li>Introduce <code>assume_ssl</code> option to allow secure session
cookies through insecure proxy.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rack/rack-session/commit/8a021430d2238cc7a0a3b5dfcc8fe44c43b984ce"><code>8a02143</code></a>
Bump minor version.</li>
<li><a
href="https://github.com/rack/rack-session/commit/67c1237a3271180010235c7831447c4351ac6a06"><code>67c1237</code></a>
Add release notes.</li>
<li><a
href="https://github.com/rack/rack-session/commit/77c56db88b22d09c4256c13232b85511aef39690"><code>77c56db</code></a>
Rack 3 compatibility.</li>
<li><a
href="https://github.com/rack/rack-session/commit/1a10ce85c38b8bff2fd8f6a62d673fd150a2f378"><code>1a10ce8</code></a>
Test on Ruby v3.4.</li>
<li><a
href="https://github.com/rack/rack-session/commit/06b63f5c5d725b3735057962b53be6147e5db666"><code>06b63f5</code></a>
Bump actions/checkout from 3 to 4 (<a
href="https://redirect.github.com/rack/rack-session/issues/47">#47</a>)</li>
<li><a
href="https://github.com/rack/rack-session/commit/98181795075eae580e866b2af6cb0775070e7ba9"><code>9818179</code></a>
Opt-in for MFA requirement (<a
href="https://redirect.github.com/rack/rack-session/issues/45">#45</a>)</li>
<li><a
href="https://github.com/rack/rack-session/commit/9ad38c0e21c13b3c758da4f924d27f2ee0edfeeb"><code>9ad38c0</code></a>
Test and set Ruby v2.5 as minimum. (<a
href="https://redirect.github.com/rack/rack-session/issues/46">#46</a>)</li>
<li><a
href="https://github.com/rack/rack-session/commit/4af61147b4ad40d6f692330f278c7cd349e1cd21"><code>4af6114</code></a>
Add cookie option &quot;partitioned&quot; to DEFAULT_OPTIONS and
documentation of class...</li>
<li><a
href="https://github.com/rack/rack-session/commit/abb6b624106ef6cee5a6a13083087da22236f277"><code>abb6b62</code></a>
Introduce <code>assume_ssl</code> option to allow secure session cookies
through insecur...</li>
<li><a
href="https://github.com/rack/rack-session/commit/178daa3d35d11d50029a904e072deaed588c449c"><code>178daa3</code></a>
Bump actions/checkout from 3 to 4 (<a
href="https://redirect.github.com/rack/rack-session/issues/37">#37</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/rack/rack-session/compare/v2.0.0...v2.1.0">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=rack-session&package-manager=bundler&previous-version=2.0.0&new-version=2.1.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after
your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating
it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

spec/tester_mongo/Gemfile.lock

@@ -165,7 +165,8 @@ GEM
       nio4r (~> 2.0)
     racc (1.8.1)
     rack (3.1.8)
-    rack-session (2.0.0)
+    rack-session (2.1.0)
+      base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.2.0)
       rack (>= 1.3)