Update postgres_exporter from 0.15.0 to 0.16.0

[prometheus-rpm-bot]

https://github.com/prometheus-community/postgres_exporter/releases/tag/v0.16.0
Release notes:

BREAKING CHANGES:

The logging system has been replaced with log/slog from the stdlib. This change is being made across the prometheus ecosystem. The logging output has changed, but the messages and levels remain the same. The `ts` label for the timestamp has bewen replaced with `time`, the accuracy is less, and the timezone is not forced to UTC. The `caller` field has been replaced by the `source` field, which now includes the full path to the source file. The `level` field now exposes the log level in capital letters.

* [CHANGE] Replace logging system #1073
* [ENHANCEMENT] Add save_wal_size and wal_status to replication_slot collector #1027
* [ENHANCEMENT] Add roles collector and connection limit metrics to database collector #997
* [ENHANCEMENT] Excluded databases log messgae is now info level #1003
* [ENHANCEMENT] Add active_time to stat_database collector #961
* [ENHANCEMENT] Add slot_type label to replication_slot collector #960
* [BUGFIX] Fix walreceiver collectore when no repmgr #1086
* [BUGFIX] Remove logging errors on replicas #1048
* [BUGFIX] Fix active_time query on postgres>=14 #1045