Bump rbs from 3.8.0 to 3.8.1

Bumps [rbs](https://github.com/ruby/rbs) from 3.8.0 to 3.8.1.
- [Release notes](https://github.com/ruby/rbs/releases)
- [Changelog](https://github.com/ruby/rbs/blob/master/CHANGELOG.md)
- [Commits](ruby/rbs@v3.8.0...v3.8.1)

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

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

Gemfile.lock

@@ -79,7 +79,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rbs (3.8.0)
+    rbs (3.8.1)
       logger
     rdoc (6.10.0)
       psych (>= 4.0.0)