Bump importmap-rails from 1.1.6 to 2.0.3

Bumps [importmap-rails](https://github.com/rails/importmap-rails) from 1.1.6 to 2.0.3.
- [Release notes](https://github.com/rails/importmap-rails/releases)
- [Commits](rails/importmap-rails@v1.1.6...v2.0.3)

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

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

Gemfile.lock

@@ -366,8 +366,9 @@ GEM
     image_processing (1.12.2)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
-    importmap-rails (1.1.6)
+    importmap-rails (2.0.3)
       actionpack (>= 6.0.0)
+      activesupport (>= 6.0.0)
       railties (>= 6.0.0)
     io-console (0.7.2)
     irb (1.14.1)