use game-ci to set up Unity

Author: jinliu9508

.github/workflows/create-release-pr.yml

@@ -52,10 +52,9 @@ jobs:
           key: unity-${{ runner.os }}-2021.3.0f1
 
       - name: Setup Unity
-        if: steps.cache-unity.outputs.cache-hit != 'true'
-        uses: buildalon/unity-setup@v2.1.1
+        uses: game-ci/unity-setup@v4
         with:
-          version: 2021.3.0f1
+          unityVersion: 2021.3.0f1
 
       - name: Verify Unity install
         run: |