Changed workflow to use actions/cache@v3 [#38]

Author: mcpierce

.github/workflows/publish-release.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v1
       - name: Cache Maven artifacts
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}