Update rspec-rails requirement from ~> 6.1 to ~> 7.1

Updates the requirements on [rspec-rails](https://github.com/rspec/rspec-rails) to permit the latest version.
- [Changelog](https://github.com/rspec/rspec-rails/blob/main/Changelog.md)
- [Commits](rspec/rspec-rails@v6.1.0...v7.1.0)

---
updated-dependencies:
- dependency-name: rspec-rails
  dependency-type: direct:development
...

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

caber.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   end
 
   spec.add_dependency "rails", ">= 7.1.4"
-  spec.add_development_dependency "rspec-rails", "~> 6.1"
+  spec.add_development_dependency "rspec-rails", "~> 7.1"
   spec.add_development_dependency "factory_bot_rails", "~> 6.4"
   spec.add_development_dependency "standardrb"
 end