Bump postgresql in /resources/custom-resources/rds-bootstrap (#192)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.13 to 42.2.25.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.13...REL42.2.25)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
...

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resources/custom-resources/rds-bootstrap/pom.xml

@@ -138,7 +138,7 @@ limitations under the License.
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.2.13</version>
+            <version>42.2.25</version>
         </dependency>
         <dependency>
             <groupId>org.mariadb.jdbc</groupId>