Bump gradle/gradle-build-action from 2.0.1 to 2.1.0

Bumps [gradle/gradle-build-action](https://github.com/gradle/gradle-build-action) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/gradle/gradle-build-action/releases)
- [Commits](gradle/gradle-build-action@v2.0.1...v2.1.0)

---
updated-dependencies:
- dependency-name: gradle/gradle-build-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/check-pages-pr.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           distribution: 'adopt'
           java-version: '8'
-      - uses: gradle/gradle-build-action@v2.0.1
+      - uses: gradle/gradle-build-action@v2.1.0
         name: gradle asciidoc
         with:
           arguments: asciidoctor

.github/workflows/gradle-build-master.yml

@@ -17,7 +17,7 @@ jobs:
       with:
         distribution: 'adopt'
         java-version: '8'
-    - uses: gradle/gradle-build-action@v2.0.1
+    - uses: gradle/gradle-build-action@v2.1.0
       name: gradle check
       with:
         arguments: check

.github/workflows/gradle-build-pr.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           distribution: 'adopt'
           java-version: '8'
-      - uses: gradle/gradle-build-action@v2.0.1
+      - uses: gradle/gradle-build-action@v2.1.0
         name: gradle check
         with:
           arguments: check

.github/workflows/publish-gh-pages.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           distribution: 'adopt'
           java-version: '8'
-      - uses: gradle/gradle-build-action@v2.0.1
+      - uses: gradle/gradle-build-action@v2.1.0
       - run: ./gradlew asciidoctor
       - run: ./gradlew javadoc
       - run: ./gradlew checkstyleMain