Bump gson from 2.8.9 to 2.9.0 (#1769)

Bumps [gson](https://github.com/google/gson) from 2.8.9 to 2.9.0.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/master/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.8.9...gson-parent-2.9.0)

---
updated-dependencies:
- dependency-name: com.google.code.gson:gson
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -325,7 +325,7 @@
       <!-- gson, to fetch entities from w3.org -->
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
-      <version>2.8.9</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>