Fix error "fatal: refusing to merge unrelated histories" by fetching the complete master

Author: JohannesDeml

.github/workflows/upgrade-unity.yml

@@ -77,7 +77,7 @@ jobs:
  - name: Merge master into current branch
  if: ${{ inputs.mergeMaster }}
  run: |
- git fetch origin master --depth=1
+ git fetch origin master
  git merge FETCH_HEAD
  git push