* MinGW - skip spec in spec/ruby/optional/capi/thread_spec.rb

C-API Thread function rb_thread_call_without_gvl
      -- runs a C function with the global lock unlocked and unlocks IO with the generic RUBY_UBF_IO

stops/freezes spec tests

See https://bugs.ruby-lang.org/issues/16265

* MinGW - skip test test/resolv/test_dns.rb

Test times out in CI (both AppVeyor & Actions), cannot repo locally

* MinGW - skip test test/ruby/test_thread_queue.rb

* Add Actions mingw.yml