Upgrade to MongoDB 4.4.0 Drivers.

Closes: #3875

pom.xml

@@ -27,7 +27,7 @@
 		<project.type>multi</project.type>
 		<dist.id>spring-data-mongodb</dist.id>
 		<springdata.commons>2.6.0-SNAPSHOT</springdata.commons>
-		<mongo>4.4.0-beta1</mongo>
+		<mongo>4.4.0</mongo>
 		<mongo.reactivestreams>${mongo}</mongo.reactivestreams>
 		<jmh.version>1.19</jmh.version>
 	</properties>

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateUnitTests.java

@@ -2558,6 +2558,11 @@ public class MongoTemplateUnitTests extends MongoOperationsUnitTests {
 			return iterator.next();
 		}
 
+		@Override
+		public int available() {
+			return 1;
+		}
+
 		@Override
 		public T tryNext() {
 			if (iterator.hasNext()) {