Bump gson from 2.8.5 to 2.8.9 in /frameworks/Java/spark (#7352)

Bumps [gson](https://github.com/google/gson) from 2.8.5 to 2.8.9.
- [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-2.8.5...gson-parent-2.8.9)

---
updated-dependencies:
- dependency-name: com.google.code.gson:gson
  dependency-type: direct:production
...

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

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

frameworks/Java/spark/pom.xml

@@ -14,7 +14,7 @@
         <maven.compiler.target>11</maven.compiler.target>
         <spark-version>2.9.0</spark-version>
         <hibernate-version>5.4.24.Final</hibernate-version>
-        <gson-version>2.8.5</gson-version>
+        <gson-version>2.8.9</gson-version>
         <mysql-connector-version>8.0.18</mysql-connector-version>
         <slf4j-version>1.7.25</slf4j-version>
         <exec.mainClass>hello.web.SparkApplication</exec.mainClass>