Bump postgresql in /containers/java-postgres/test-project (#1695)

containers/java-postgres/test-project/pom.xml

@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.3.3</version>
+      <version>42.3.8</version>
     </dependency>
   </dependencies>