Merge pull request #20 from io7m-com/dependabot/maven/develop/org.pos…

…tgresql-postgresql-42.7.4

Bump org.postgresql:postgresql from 42.7.3 to 42.7.4

pom.xml

@@ -116,7 +116,7 @@
       <dependency>
         <groupId>org.postgresql</groupId>
         <artifactId>postgresql</artifactId>
-        <version>42.7.3</version>
+        <version>42.7.4</version>
       </dependency>
 
       <!-- Build metadata. -->