Bump rbs from 3.9.0 to 3.9.2 in /steep

Bumps [rbs](https://github.com/ruby/rbs) from 3.9.0 to 3.9.2.
- [Release notes](https://github.com/ruby/rbs/releases)
- [Changelog](https://github.com/ruby/rbs/blob/master/CHANGELOG.md)
- [Commits](v3.9.0...v3.9.2)

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

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

Author: dependabot[bot]

steep/Gemfile

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-gem "rbs", "~> 3.9.pre"
+gem "rbs", "~> 3.9"
 gem "steep", "~> 1.10"
 gem "ruby-lsp"
 gem "test-unit"

steep/Gemfile.lock

@@ -44,7 +44,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rbs (3.9.0)
+    rbs (3.9.2)
       logger
     ruby-lsp (0.23.14)
       language_server-protocol (~> 3.17.0)
@@ -86,7 +86,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  rbs (~> 3.9.pre)
+  rbs (~> 3.9)
   ruby-lsp
   steep (~> 1.10)
   test-unit