Bump tinymce-rails from 7.3.0 to 7.6.0

Bumps [tinymce-rails](https://github.com/spohlenz/tinymce-rails) from 7.3.0 to 7.6.0.
- [Release notes](https://github.com/spohlenz/tinymce-rails/releases)
- [Commits](spohlenz/tinymce-rails@v7.3.0...v7.6.0)

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

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

Gemfile.lock

@@ -487,7 +487,7 @@ GEM
     thor (1.3.2)
     tilt (2.4.0)
     timeout (0.4.3)
-    tinymce-rails (7.3.0)
+    tinymce-rails (7.6.0)
       railties (>= 3.1.1)
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)