Actions config: use setup-java@v3 to improve caching

Author: SethTisue

.github/workflows/ci.yml

@@ -16,10 +16,10 @@ jobs:
     - uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - uses: coursier/cache-action@v6
-    - uses: actions/setup-java@v2
+    - uses: actions/setup-java@v3
       with:
         distribution: temurin
         java-version: ${{matrix.java}}
+        cache: sbt
     - name: Test
       run: sbt ++${{matrix.scala}} test headerCheck versionPolicyCheck package