Bump rbs from 3.1.0 to 3.1.1 in /steep

Bumps [rbs](https://github.com/ruby/rbs) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/ruby/rbs/releases)
- [Changelog](https://github.com/ruby/rbs/blob/master/CHANGELOG.md)
- [Commits](v3.1.0...v3.1.1)

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

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

steep/Gemfile

@@ -1,4 +1,4 @@
 source "https://rubygems.org"
 
-gem "rbs", "~> 3.1.0"
+gem "rbs", "~> 3.1.1"
 gem "steep", "~> 1.5.2"

steep/Gemfile.lock

@@ -28,7 +28,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rbs (3.1.0)
+    rbs (3.1.1)
     securerandom (0.2.2)
     steep (1.5.2)
       activesupport (>= 5.1)
@@ -56,7 +56,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  rbs (~> 3.1.0)
+  rbs (~> 3.1.1)
   steep (~> 1.5.2)
 
 BUNDLED WITH