Bump org.postgresql:postgresql from 42.7.4 to 42.7.7 (#98)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.4 to 42.7.7.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.4...REL42.7.7)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-version: 42.7.7
  dependency-type: direct:development
...

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pom.xml

@@ -505,7 +505,7 @@
         <dependency>
           <groupId>org.postgresql</groupId>
           <artifactId>postgresql</artifactId>
-          <version>42.7.4</version>
+          <version>42.7.7</version>
           <scope>test</scope>
         </dependency>
       </dependencies>
@@ -529,7 +529,7 @@
         <dependency>
           <groupId>org.postgresql</groupId>
           <artifactId>postgresql</artifactId>
-          <version>42.7.4</version>
+          <version>42.7.7</version>
           <scope>test</scope>
         </dependency>
       </dependencies>