Upgrading to cache actions v4. (#105)

Author: kevinpalis

.github/workflows/tag-publish.yml

@@ -108,7 +108,7 @@ jobs:
         java-version: 17
 
     - name: Cache Gradle packages
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches