Update pg requirement from = 1.2.2 to = 1.2.3
Update pg requirement from = 1.2.2 to = 1.2.3

Updates the requirements on [pg](https://github.com/ged/ruby-pg) to permit the latest version.
- [Release notes](https://github.com/ged/ruby-pg/releases)
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.rdoc)
- [Commits](https://github.com/ged/ruby-pg/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sensu-plugins/sensu-plugins-postgres