Bump gson from 2.8.7 to 2.8.8

Bumps [gson](https://github.com/google/gson) from 2.8.7 to 2.8.8.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/master/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.8.7...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>

pom.xml

@@ -7,7 +7,7 @@
     <properties>
         <jackson2.version>2.12.4</jackson2.version>
         <moshi.version>1.12.0</moshi.version>
-        <gson.version>2.8.7</gson.version>
+        <gson.version>2.8.8</gson.version>
         <hamcrest.version>2.2</hamcrest.version>
         <johnzon.version>1.2.14</johnzon.version>
         <geronimo.jsonp.version>1.5</geronimo.jsonp.version>