chore(deps-dev): bump org.postgresql:postgresql (#655)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.6 to 42.7.7.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.6...REL42.7.7)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-version: 42.7.7
  dependency-type: direct:development
...

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

Author: dependabot[bot]

alloydb-jdbc-connector/pom.xml

@@ -40,7 +40,7 @@
   <url>https://github.com/GoogleCloudPlatform/alloydb-java-connector</url>
 
   <properties>
-    <postgresql.version>42.7.6</postgresql.version>
+    <postgresql.version>42.7.7</postgresql.version>
   </properties>
 
   <build>