CI: Add current Elixir and Erlang/OTP GA versions to test matrix#254

sgerrand wants to merge 3 commits intopow-auth:mainpow-auth/pow_assent:mainfrom

sgerrand:ci-bump-elixir-1.18-otp-27.2sgerrand/pow_assent:ci-bump-elixir-1.18-otp-27.2Copy head branch name to clipboard