Update sql_exporter from 0.17.1 to 0.18.4

[prometheus-rpm-bot]

https://github.com/burningalchemist/sql_exporter/releases/tag/0.18.4
Release notes:

## SQL Exporter v0.18.4

This release addresses the issue with loading collector files from the environment variable (#830).

## What's Changed

Precompiled binaries are built with Go v1.24.9

* fix: collector_files env should be handled properly by @burningalchemist in https://github.com/burningalchemist/sql_exporter/pull/831
* docs: organize examples directory [skip ci] by @burningalchemist in https://github.com/burningalchemist/sql_exporter/pull/832
* build(nfpm): fix paths for deb/rpm packages [skip ci] by @burningalchemist in https://github.com/burningalchemist/sql_exporter/pull/834

**Full Changelog**: https://github.com/burningalchemist/sql_exporter/compare/0.18.3...0.18.4