Bump gradle/actions to 6.4.1

Author: mrotteveel

.github/workflows/run-tests.yml

@@ -52,7 +52,7 @@ jobs:
           distribution: 'temurin'
           cache-jdk: true
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@3f5f9adaf7d9fecd50b5935e54106014257a94e6
+        uses: gradle/actions/setup-gradle@8da46b539cd8fe6ab27ca75128919a18d757604c
         with:
           cache-read-only: ${{ github.ref != 'refs/heads/Branch_5_0' }}
       - name: Build with Gradle