Bump gradle/wrapper-validation-action from 3.3.2 to 3.4.2

Bumps [gradle/wrapper-validation-action](https://github.com/gradle/wrapper-validation-action) from 3.3.2 to 3.4.2.
- [Release notes](https://github.com/gradle/wrapper-validation-action/releases)
- [Commits](https://github.com/gradle/wrapper-validation-action/compare/216d1ad2b3710bf005dc39237337b9673fd8fcd5...88425854a36845f9c881450d9660b5fd46bee142)

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

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

.github/workflows/build-documentation.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Congfigure vega-cli
         run: npm i -g vega-cli --unsafe
       - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@216d1ad2b3710bf005dc39237337b9673fd8fcd5
+        uses: gradle/wrapper-validation-action@88425854a36845f9c881450d9660b5fd46bee142
       - name: Install additional software
         run: |
             sudo apt-get update