Windows: Run one spec file per CPU core

Author: bastelfreak

.github/workflows/tests.yaml

@@ -90,7 +90,7 @@ jobs:
           ruby -ropenssl -e 'puts "OpenSSL Version - #{OpenSSL::OPENSSL_VERSION}"; puts "OpenSSL Library Version - #{OpenSSL::OPENSSL_LIBRARY_VERSION}"'
 
           # Run tests
-          bundle exec rake parallel:spec[2]
+          bundle exec rake parallel:spec
 
       - name: Run tests on Linux
         if: runner.os == 'Linux'