fix: dbptk-modules/dbptk-module-postgresql/pom.xml to reduce vulnerab…

…ilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGPOSTGRESQL-6252740

dbptk-modules/dbptk-module-postgresql/pom.xml

@@ -29,7 +29,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>9.4.1212.jre7</version>
+            <version>42.2.28.jre7</version>
         </dependency>
     </dependencies>
 </project>