Bump org.postgresql:postgresql in /kafka-sql-transaction

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.7 to 42.7.11.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pgjdbc/pgjdbc/compare/REL42.7.7...REL42.7.11)

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

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

kafka-sql-transaction/pom.xml

diff --git a/kafka-sql-transaction/pom.xml b/kafka-sql-transaction/pom.xml
index 8d8419d..af21fc5 100644
--- a/kafka-sql-transaction/pom.xml
+++ b/kafka-sql-transaction/pom.xml
@@ -90,7 +90,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.7.7</version>
+            <version>42.7.11</version>
         </dependency>
     </dependencies>