Bump rails from f6987c4 to 28deb8b

Bumps [rails](https://github.com/rails/rails) from `f6987c4` to `28deb8b`.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](f6987c4657...28deb8bb7a)

---
updated-dependencies:
- dependency-name: rails
  dependency-type: direct:production
...

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

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/rails/rails.git
-  revision: f6987c46572666c439a1ad68b3ab5b41645f2bcf
+  revision: 28deb8bb7a6071573e43a463e766ac6eeeb82601
   branch: 7-1-stable
   specs:
     actioncable (7.1.1)