[GWC-1259] Upgrade PostgreSQL driver from 42.7.2 to 42.7.3

Author: sikeoka

geowebcache/pom.xml

@@ -68,7 +68,7 @@
     <log4j.version>2.17.2</log4j.version>
     <h2.version>1.1.119</h2.version>
     <hsql.version>2.7.1</hsql.version>
-    <postgresql.version>42.7.2</postgresql.version>
+    <postgresql.version>42.7.3</postgresql.version>
     <oracle.version></oracle.version>
     <java.awt.headless>true</java.awt.headless>
     <jalopy.phase>disabled</jalopy.phase>