Bump importmap-rails from 2.0.3 to 2.1.0 (#1567)

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](https://github.com/rails/importmap-rails/compare/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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -208,7 +208,7 @@ GEM
     image_processing (1.13.0)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
-    importmap-rails (2.0.3)
+    importmap-rails (2.1.0)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)