build(deps): bump prometheus-client from 4.2.2 to 4.2.3

Bumps [prometheus-client](https://github.com/prometheus/client_ruby) from 4.2.2 to 4.2.3.
- [Release notes](https://github.com/prometheus/client_ruby/releases)
- [Changelog](https://github.com/prometheus/client_ruby/blob/main/CHANGELOG.md)
- [Commits](prometheus/client_ruby@v4.2.2...v4.2.3)

---
updated-dependencies:
- dependency-name: prometheus-client
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -360,7 +360,8 @@ GEM
       ast (~> 2.4.1)
       racc
     pg (1.5.6)
-    prometheus-client (4.2.2)
+    prometheus-client (4.2.3)
+      base64
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)