Bump gradle/actions/setup-gradle from 6.3.0 to 6.4.0 (#789)

Bumps [gradle/actions/setup-gradle](https://github.com/gradle/actions) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/gradle/actions/releases)
- [Commits](gradle/actions@9c97196...3f5f9ad)

---
updated-dependencies:
- dependency-name: gradle/actions/setup-gradle
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-docker.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           persist-credentials: false
       - name: "Set up Gradle"
-        uses: "gradle/actions/setup-gradle@9c971963bec38e04b3d30dcc455b5382be2fdbfb" # v6.3.0
+        uses: "gradle/actions/setup-gradle@3f5f9adaf7d9fecd50b5935e54106014257a94e6" # v6.4.0
         with:
           cache-disabled: true
       - name: "Set up Java"

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           persist-credentials: false
       - name: "Set up Gradle"
-        uses: "gradle/actions/setup-gradle@9c971963bec38e04b3d30dcc455b5382be2fdbfb" # v6.3.0
+        uses: "gradle/actions/setup-gradle@3f5f9adaf7d9fecd50b5935e54106014257a94e6" # v6.4.0
         with:
           cache-disabled: true
       - name: "Set up Java"