Bump org.postgresql:postgresql from 42.7.1 to 42.7.3 (#6039)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.1 to 42.7.3.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pgjdbc/pgjdbc/compare/REL42.7.1...REL42.7.3)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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build.gradle

@@ -56,7 +56,7 @@ ext {
         //datasource
         "p6spy"                      : "p6spy:p6spy:3.9.1",
         "sqlserver"                  : "com.microsoft.sqlserver:sqljdbc4:4.0",
-        "postgresql"                 : "org.postgresql:postgresql:42.7.1",
+        "postgresql"                 : "org.postgresql:postgresql:42.7.3",
         "oracle"                     : fileTree(dir: 'libs', includes: ['ojdbc8.jar']),
         "dm"                         : fileTree(dir: 'libs', includes: ["jdbcDriver-18.jar"]),
         "kingbase"                   : fileTree(dir: 'libs', includes: ["kingbase8-8.2.0.jar"]),