build(deps): bump rails in /gemfiles/rails-main

Bumps [rails](https://github.com/rails/rails) from `ae6fa7a` to `08473e3`.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](rails/rails@ae6fa7a...08473e3)

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

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

gemfiles/rails-main/Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/rails/rails.git
-  revision: ae6fa7a048d0a0f79b0f8dd8566c7d499fd6f616
+  revision: 08473e3898b7faa163a5849bae61ac698e41981e
   branch: main
   specs:
     actioncable (7.2.0.alpha)
@@ -33,6 +33,7 @@ GIT
       actionview (= 7.2.0.alpha)
       activesupport (= 7.2.0.alpha)
       nokogiri (>= 1.8.5)
+      racc
       rack (>= 2.2.4)
       rack-session (>= 1.0.1)
       rack-test (>= 0.6.3)
@@ -74,7 +75,6 @@ GIT
       drb
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
-      mutex_m
       tzinfo (~> 2.0)
     rails (7.2.0.alpha)
       actioncable (= 7.2.0.alpha)
@@ -147,8 +147,7 @@ GEM
     mini_mime (1.1.5)
     minitest (5.20.0)
     multipart-post (2.3.0)
-    mutex_m (0.1.2)
-    net-imap (0.4.1)
+    net-imap (0.4.2)
       date
       net-protocol
     net-pop (0.1.2)
@@ -212,7 +211,7 @@ GEM
     rspec-support (3.12.1)
     ruby2_keywords (0.0.5)
     stringio (3.0.8)
-    thor (1.2.2)
+    thor (1.3.0)
     timeout (0.4.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)