Update rbs requirement from ~> 3.5.1 to ~> 3.5.2

Updates the requirements on [rbs](https://github.com/ruby/rbs) to permit the latest version.

Updates `rbs` to 3.5.2
- [Release notes](https://github.com/ruby/rbs/releases)
- [Changelog](https://github.com/ruby/rbs/blob/master/CHANGELOG.md)
- [Commits](ruby/rbs@v3.5.1...v3.5.2)

---
updated-dependencies:
- dependency-name: rbs
  dependency-type: direct:development
  dependency-group: rbs-dependencies
...

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

Gemfile

@@ -13,7 +13,7 @@ end
 
 group(:development) do
   gem('debug', '~> 1.9.2', require: false)
-  gem('rbs', '~> 3.5.1', require: false)
+  gem('rbs', '~> 3.5.2', require: false)
   gem('steep', '~> 1.7.1', require: false)
   gem('benchmark-ips', '~> 2.13.0', require: false)
   gem('stackprof')