Bump mongodb-driver-sync from 4.8.0 to 4.8.1 (#485)

Bumps [mongodb-driver-sync](https://github.com/mongodb/mongo-java-driver) from 4.8.0 to 4.8.1.
- [Release notes](https://github.com/mongodb/mongo-java-driver/releases)
- [Commits](mongodb/mongo-java-driver@r4.8.0...r4.8.1)

---
updated-dependencies:
- dependency-name: org.mongodb:mongodb-driver-sync
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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pom.xml

@@ -83,7 +83,7 @@
         <logstash.version>7.2</logstash.version>
         <mongodb-driver-core.version>4.8.1</mongodb-driver-core.version>
         <mongodb-driver-reactivestreams.version>4.8.0</mongodb-driver-reactivestreams.version>
-        <mongodb-driver-sync.version>4.8.0</mongodb-driver-sync.version>
+        <mongodb-driver-sync.version>4.8.1</mongodb-driver-sync.version>
         <mongo-java-driver.version>3.12.11</mongo-java-driver.version>
         <mongo-java-server.version>1.43.0</mongo-java-server.version>
         <netty.version>4.1.85.Final</netty.version>