Bump gson from 2.8.6 to 2.8.8 (#6721)

Bumps [gson](https://github.com/google/gson) from 2.8.6 to 2.8.8.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/master/CHANGELOG.md)
- [Commits](https://github.com/google/gson/compare/gson-parent-2.8.6...gson-parent-2.8.8)

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

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

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

pom.xml

@@ -30,7 +30,7 @@
     <jsp.version>9.0.48</jsp.version>
     <infinispan.version>9.4.8.Final</infinispan.version>
     <infinispan.protostream.version>4.3.4.Final</infinispan.protostream.version>
-    <gson.version>2.8.6</gson.version>
+    <gson.version>2.8.8</gson.version>
     <alpn.agent.version>2.0.10</alpn.agent.version>
     <hazelcast.version>4.1</hazelcast.version>
     <conscrypt.version>2.5.1</conscrypt.version>