deps: update dependency org.postgresql:postgresql to v42.7.3

samples/cloud-run/java/pom.xml

@@ -51,7 +51,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.7.2</version>
+      <version>42.7.3</version>
       <scope>compile</scope>
     </dependency>
     <!-- This dependency allows us to use Unix Domain Sockets to connect to PGAdapter/PostgreSQL. -->