chore(deps): bump importmap-rails from 2.0.3 to 2.1.0

Bumps [importmap-rails](https://github.com/rails/importmap-rails) from 2.0.3 to 2.1.0.
- [Release notes](https://github.com/rails/importmap-rails/releases)
- [Commits](rails/importmap-rails@v2.0.3...v2.1.0)

---
updated-dependencies:
- dependency-name: importmap-rails
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -133,7 +133,7 @@ GEM
       rake (>= 13)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
-    importmap-rails (2.0.3)
+    importmap-rails (2.1.0)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)
@@ -216,7 +216,7 @@ GEM
       rack (>= 1.2.0)
     rack-session (2.0.0)
       rack (>= 3.0.0)
-    rack-test (2.1.0)
+    rack-test (2.2.0)
       rack (>= 1.3)
     rackup (2.2.1)
       rack (>= 3)