Upgrade to postgresql 42.4.1.

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.0 to 42.4.1.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.4.0...REL42.4.1)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Closes #1302

Author: dependabot[bot]

spring-data-r2dbc/pom.xml

@@ -26,7 +26,7 @@
 		<sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
 
 		<degraph-check.version>0.1.4</degraph-check.version>
-		<postgresql.version>42.4.0</postgresql.version>
+		<postgresql.version>42.4.1</postgresql.version>
 		<r2dbc-postgresql.version>1.0.0.RC1</r2dbc-postgresql.version>
 		<r2dbc-h2.version>1.0.0.RC1</r2dbc-h2.version>
 		<r2dbc-mssql.version>1.0.0.RC1</r2dbc-mssql.version>