Bump mongo from 2.19.1 to 2.19.2 in /spec/tester_mongo (#294)

Bumps [mongo](https://github.com/mongodb/mongo-ruby-driver) from 2.19.1
to 2.19.2.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/mongodb/mongo-ruby-driver/releases">mongo's
releases</a>.</em></p>
<blockquote>
<h2>2.19.2</h2>
<p>This is a patch release that fixes the following issue:</p>
<ul>
<li><a href="https://jira.mongodb.org/browse/RUBY-3332">RUBY-3332
Tailable cursors do no work</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/mongodb/mongo-ruby-driver/commit/525c48e0739c0b9189d73f2f1d0dac1fc2cf6576"><code>525c48e</code></a>
Bump version to 2.19.2</li>
<li><a
href="https://github.com/mongodb/mongo-ruby-driver/commit/c46c1185cdc28be8d9a51dd17fa2b5853a32c406"><code>c46c118</code></a>
RUBY-3332 Fix tailable cursors</li>
<li><a
href="https://github.com/mongodb/mongo-ruby-driver/commit/877a9b628bede09ede206def16455eac09f45c2f"><code>877a9b6</code></a>
DOCSP-32949: docs link to the BSON 4.x Tutorial (<a
href="https://redirect.github.com/mongodb/mongo-ruby-driver/issues/2784">#2784</a>)
(<a
href="https://redirect.github.com/mongodb/mongo-ruby-driver/issues/2785">#2785</a>)</li>
<li>See full diff in <a
href="https://github.com/mongodb/mongo-ruby-driver/compare/v2.19.1...v2.19.2">compare
view</a></li>
</ul>
</details>
<br />


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spec/tester_mongo/Gemfile.lock

@@ -126,7 +126,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.5)
     minitest (5.20.0)
-    mongo (2.19.1)
+    mongo (2.19.2)
       bson (>= 4.14.1, < 5.0.0)
     mongoid (8.1.3)
       activemodel (>= 5.1, < 7.2, != 7.0.0)