Update rspec-rails requirement from ~> 4.1.0 to ~> 5.1.2

Updates the requirements on [rspec-rails](https://github.com/rspec/rspec-rails) to permit the latest version.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/main/Changelog.md)
- [Commits](rspec/rspec-rails@v4.1.0...v5.1.2)

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

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

calagator.gemspec

@@ -62,7 +62,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec-activemodel-mocks', '~> 1.1.0'
   s.add_development_dependency 'rspec-collection_matchers', '~> 1.1'
   s.add_development_dependency 'rspec-its', '~> 1.1'
-  s.add_development_dependency 'rspec-rails', '~> 4.1.0'
+  s.add_development_dependency 'rspec-rails', '~> 5.1.2'
   # s.add_development_dependency 'rubocop', '~> 0.80.0'
   # s.add_development_dependency 'rubocop-performance', '~> 1.5.0'
   # s.add_development_dependency 'rubocop-rails', '~> 2.5.2'