Update rbs requirement from ~> 3.7.0 to >= 3.7, < 3.9

Updates the requirements on [rbs](https://github.com/ruby/rbs) to permit the latest version.
- [Release notes](https://github.com/ruby/rbs/releases)
- [Changelog](https://github.com/ruby/rbs/blob/master/CHANGELOG.md)
- [Commits](ruby/rbs@v3.7.0...v3.8.0)

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

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

Gemfile.lock

@@ -12,7 +12,7 @@ PATH
       logger (>= 1.3.0)
       parser (>= 3.1)
       rainbow (>= 2.2.2, < 4.0)
-      rbs (~> 3.7.0)
+      rbs (>= 3.7, < 3.9)
       securerandom (>= 0.1)
       strscan (>= 1.0.0)
       terminal-table (>= 2, < 4)
@@ -79,7 +79,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rbs (3.7.0)
+    rbs (3.8.0)
       logger
     rdoc (6.10.0)
       psych (>= 4.0.0)

steep.gemspec

@@ -42,7 +42,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "rainbow", ">= 2.2.2", "< 4.0"
   spec.add_runtime_dependency "listen", "~> 3.0"
   spec.add_runtime_dependency "language_server-protocol", ">= 3.15", "< 4.0"
-  spec.add_runtime_dependency "rbs", "~> 3.7.0"
+  spec.add_runtime_dependency "rbs", ">= 3.7", "< 3.9"
   spec.add_runtime_dependency "concurrent-ruby", ">= 1.1.10"
   spec.add_runtime_dependency "terminal-table", ">= 2", "< 4"
   spec.add_runtime_dependency "securerandom", ">= 0.1"