Update name pattern for test files

Since December 2021, Bundler gem now defaults to test_filename.rb instead of filename_test.rb in release 2.3.0

bundle gem generated MiniTest file and class now start with 'test' rubygems/rubygems#3893

This release addresses this change by updating what's considered a test file when matching specs.

A change in filename.rb will now consider these files as possible matches:

• filename_test.rb
• filename_spec.rb
• test_filename.rb
• spec_filename.rb (because why not)