Bump postgresql from 42.3.3 to 42.4.1 in /frameworks/Java/spring-webflux

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.3 to 42.4.1.
- [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/REL42.3.3...REL42.4.1)

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

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

frameworks/Java/spring-webflux/pom.xml

@@ -21,7 +21,7 @@
         <maven.compiler.target>11</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <spring-data-r2dbc.version>1.0.0.M2</spring-data-r2dbc.version>
-        <postgresql.version>42.3.3</postgresql.version>
+        <postgresql.version>42.4.1</postgresql.version>
         <pgclient.version>0.11.4</pgclient.version>
         <rxjava2-jdbc.version>0.2.4</rxjava2-jdbc.version>
         <r2dbc-postgresql.version>1.0.0.M7</r2dbc-postgresql.version>