deps: update dependency org.postgresql:postgresql to v42.7.4 (googleapis#1722)

Author: renovate-bot

samples/spring-data-jdbc/pom.xml

@@ -67,7 +67,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.7.3</version>
+      <version>42.7.4</version>
     </dependency>
 
     <!-- Add OpenTelemetry for tracing and metrics. -->

samples/spring-data-mybatis/pom.xml

@@ -62,7 +62,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.7.3</version>
+      <version>42.7.4</version>
     </dependency>
 
     <dependency>