Bump mongodb-driver-sync from 4.2.0 to 4.2.1 in /frameworks/Java/javalin

Bumps [mongodb-driver-sync](https://github.com/mongodb/mongo-java-driver) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/mongodb/mongo-java-driver/releases)
- [Commits](https://github.com/mongodb/mongo-java-driver/compare/r4.2.0...r4.2.1)

---
updated-dependencies:
- dependency-name: org.mongodb:mongodb-driver-sync
  dependency-type: direct:production
...

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

frameworks/Java/javalin/pom.xml

@@ -16,7 +16,7 @@
         <jackson.version>2.12.6.1</jackson.version>
         <hikaricp.version>4.0.2</hikaricp.version>
         <postgresql.version>42.3.3</postgresql.version>
-        <mongodb.version>4.2.0</mongodb.version>
+        <mongodb.version>4.2.1</mongodb.version>
         <pebble.version>3.1.5</pebble.version>
     </properties>