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:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -25,7 +25,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.7</version>
+            <version>2.8.8</version>
         </dependency>
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>