build(deps): bump importmap-rails from 1.1.5 to 1.1.6

Bumps [importmap-rails](https://github.com/rails/importmap-rails) from 1.1.5 to 1.1.6.
- [Release notes](https://github.com/rails/importmap-rails/releases)
- [Commits](rails/importmap-rails@v1.1.5...v1.1.6)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -127,7 +127,7 @@ GEM
       multi_xml (>= 0.5.2)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    importmap-rails (1.1.5)
+    importmap-rails (1.1.6)
       actionpack (>= 6.0.0)
       railties (>= 6.0.0)
     itamae (1.14.1)