Bump postgresql from 42.2.10 to 42.2.11 (JabRef#6131)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.10 to 42.2.11.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.10...REL42.2.11)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

build.gradle

@@ -143,7 +143,7 @@ dependencies {
 
     implementation group: 'org.mariadb.jdbc', name: 'mariadb-java-client', version: '2.5.4'
 
-    implementation 'org.postgresql:postgresql:42.2.10'
+    implementation 'org.postgresql:postgresql:42.2.11'
 
     implementation ('com.oracle.ojdbc:ojdbc10:19.3.0.0') {
         // causing module issues