Update rspec-rails requirement from ~> 6.0 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@v6.0.0...v7.1.0)

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

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

Author: dependabot[bot]

alchemy-devise.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "factory_bot_rails"
   s.add_development_dependency "rails-controller-testing"
   s.add_development_dependency "rspec-activemodel-mocks", "~> 1.0"
-  s.add_development_dependency "rspec-rails", "~> 6.0"
+  s.add_development_dependency "rspec-rails", "~> 7.1"
   s.add_development_dependency "simplecov"
 
   s.post_install_message = <<~MSG