tests: fix the PR title check broken by the action bump to v6.1.1 - #410

Unknown release type "tests" found in pull request title "tests: fix the PR title check broken by the action bump to v6.1.1". Available types: - bugfix # bug fixes - change # backward incompatible changes - doc # documentation changes including code comments - editor # code editor related configurations - feature # implementing a new feature - optimize # performance optimizations - refactor # code refactoring and other code rearrangement - style # coding style changes - tests # test suite changes