Bump gson from 2.4 to 2.9.1 in /drive/snippets/drive_v2 (#330)

Bumps [gson](https://github.com/google/gson) from 2.4 to 2.9.1.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/master/CHANGELOG.md)
- [Commits](google/gson@gson-2.4...gson-parent-2.9.1)

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

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drive/snippets/drive_v2/build.gradle

@@ -9,7 +9,7 @@ dependencies {
     implementation 'com.google.api-client:google-api-client:1.23.0'
     implementation 'com.google.auth:google-auth-library-oauth2-http:1.10.0'
     implementation 'com.google.oauth-client:google-oauth-client-jetty:1.32.1'
-    implementation 'com.google.code.gson:gson:2.4'
+    implementation 'com.google.code.gson:gson:2.9.1'
     testImplementation 'junit:junit:4.13.2'
 }