deps: update dependency org.mockito:mockito-core to v3.4.3 (#165)

Author: renovate-bot

google-cloud-pubsublite/pom.xml

@@ -118,7 +118,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>3.4.2</version>
+      <version>3.4.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>

pubsublite-beam-io/pom.xml

@@ -105,7 +105,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>3.4.2</version>
+      <version>3.4.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>