Update to support Rails 7 and above

This commit updates the rails dependencies to support rails 7. As part
of this commit the version constraints on the other gems were removed in
order to support all versions of rails under version 7.

[1205854219658133](https://app.asana.com/0/0/1205854219658133/f)

interpret_date.gemspec

@@ -18,8 +18,8 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency 'activerecord', ['>= 5.1', '< 7']
-  spec.add_development_dependency "bundler", "~> 1.6"
-  spec.add_development_dependency "rake", "~> 12"
-  spec.add_development_dependency "rspec", "~> 3.2"
+  spec.add_runtime_dependency 'activerecord', '<= 7'
+  spec.add_development_dependency "bundler"
+  spec.add_development_dependency "rake"
+  spec.add_development_dependency "rspec"
 end

lib/interpret_date/version.rb

@@ -1,3 +1,3 @@
 module InterpretDate
-  VERSION = "1.3.5"
+  VERSION = "1.3.6"
 end