Bump postgresql from 42.2.9 to 42.2.12 in /PgBulkInsert

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.9 to 42.2.12.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.9...REL42.2.12)

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

Author: dependabot-preview[bot]

PgBulkInsert/pom.xml

@@ -118,7 +118,7 @@
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-        <postgresql.version>42.2.9</postgresql.version>
+        <postgresql.version>42.2.12</postgresql.version>
         <junit.version>4.13</junit.version>
     </properties>