Build(deps): Bump org.postgresql:postgresql from 42.6.0 to 42.7.1

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.6.0 to 42.7.1.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.6.0...REL42.7.1)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -25,7 +25,7 @@ tasks.register("printFlinkVersion") {
 ext {
     flinkVersion = '1.17.1'
     jacksonVersion = '2.15.2'
-    postgresJDBCVersion = '42.6.0'
+    postgresJDBCVersion = '42.7.1'
     crateJDBCVersion = '2.7.0'
     slf4jVersion = '2.0.7'
     log4jVersion = '2.20.0'