Upgrade to MongoDB Driver 4.9.0.

Closes #2224

Author: mp911de

spring-data-rest-tests/spring-data-rest-tests-mongodb/pom.xml

@@ -36,7 +36,7 @@
 		<dependency>
 			<groupId>org.mongodb</groupId>
 			<artifactId>mongodb-driver-sync</artifactId>
-			<version>4.8.0</version>
+			<version>4.9.0</version>
 		</dependency>
 
 		<dependency>