Bump postgresql from 42.2.7 to 42.2.8 (#1009)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.7 to 42.2.8.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.7...REL42.2.8)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

elide-example/elide-blog-example/pom.xml

@@ -49,7 +49,7 @@
 
     <properties>
         <jar.finalName>elide-blog-example</jar.finalName>
-        <postgres.version>42.2.7</postgres.version>
+        <postgres.version>42.2.8</postgres.version>
         <liquibase.version>3.8.0</liquibase.version>
     </properties>