ci: Add write permission to release action so it can create the branch#57

Christopher-Chianelli merged 2 commits intoTimefoldAI:mainTimefoldAI/timefold-solver-python:mainfrom

Christopher-Chianelli:fix-action-permissionsChristopher-Chianelli/timefold-solver-python:fix-action-permissionsCopy head branch name to clipboard