ci: bump cache to v3.0.1

Author: jsm174

.github/workflows/build.yml

@@ -57,7 +57,7 @@ jobs:
         with:
           name: Plugins
           path: VisualPinball.Unity/Plugins
-      - uses: actions/[email protected].0
+      - uses: actions/[email protected].1
         with:
          path: VisualPinball.Unity/VisualPinball.Unity.Test/TestProject~/Library
          key: Library-Test-Project