build(deps): bump org.postgresql:postgresql in /samples/java/liquibase (

#1241)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

samples/java/liquibase/pom.xml

@@ -71,7 +71,7 @@
             <dependency>
               <groupId>org.postgresql</groupId>
               <artifactId>postgresql</artifactId>
-              <version>42.6.0</version>
+              <version>42.7.1</version>
             </dependency>
           </dependencies>
         </plugin>