Bump org.postgresql:postgresql from 42.7.2 to 42.7.11 in /blackbox-tests

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.2 to 42.7.11.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.2...REL42.7.11)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-version: 42.7.11
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

blackbox-tests/pom.xml

@@ -41,7 +41,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.7.2</version>
+      <version>42.7.11</version>
       <scope>test</scope>
     </dependency>