Update dependency org.postgresql:postgresql to v42.7.8

Author: renovate[bot]

pom.xml

@@ -119,7 +119,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.7.7</version>
+      <version>42.7.8</version>
       <scope>runtime</scope>
     </dependency>