Merge pull request #139 from papyri/dependabot/maven/pn-sync/org.post…

…gresql-postgresql-42.4.1

Bump postgresql from 42.3.3 to 42.4.1 in /pn-sync

pn-sync/pom.xml

@@ -52,7 +52,7 @@
         <dependency>
           <groupId>org.postgresql</groupId>
           <artifactId>postgresql</artifactId>
-          <version>42.3.3</version>
+          <version>42.4.1</version>
         </dependency>
         <dependency>
           <groupId>net.sf.saxon</groupId>