[godot] GH action

.github/workflows/spine-godot.yml

@@ -199,7 +199,7 @@ jobs:
           path: spine-godot/godot/bin/windows_64_release.exe
 
   godot-template-android:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
         with: