Use github actions cache not my own one.

(cherry picked from commit f2feefb367)

.github/workflows/windows_builds.yml

@@ -24,7 +24,7 @@ jobs:
       # Editing this is pretty dangerous for Windows since it can break and needs to be properly tested with a fresh cache.
     - name: Load .scons_cache directory
       id: windows-editor-cache
-      uses: RevoluPowered/cache@v2.1
+      uses: actions/cache@v2
       with:
         path: /.scons_cache/
         key: ${{github.job}}-${{env.GODOT_BASE_BRANCH}}-${{github.ref}}-${{github.sha}}