Update dependency org.postgresql:postgresql to v42.7.4 (#52)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

pom.xml

@@ -52,7 +52,7 @@
     <wagon-ssh.version>2.12</wagon-ssh.version>
     <guava.version>17.0</guava.version>
     <commons-exec.version>1.3</commons-exec.version>
-    <postgresql.version>42.7.3</postgresql.version>
+    <postgresql.version>42.7.4</postgresql.version>
     <hikaricp.version>3.4.5</hikaricp.version>
     <validation-api.version>2.0.1.Final</validation-api.version>
     <hibernate-validator.version>6.2.5.Final</hibernate-validator.version>