[pip](deps): Update prometheus-async requirement in the prod-deps group

Updates the requirements on [prometheus-async](https://github.com/hynek/prometheus-async) to permit the latest version.

Updates `prometheus-async` to 25.1.0
- [Release notes](https://github.com/hynek/prometheus-async/releases)
- [Changelog](https://github.com/hynek/prometheus-async/blob/main/CHANGELOG.md)
- [Commits](hynek/prometheus-async@22.2.0...25.1.0)

---
updated-dependencies:
- dependency-name: prometheus-async
  dependency-type: direct:production
  dependency-group: prod-deps
...

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

requirements.txt

@@ -10,7 +10,7 @@ psutil>=6.1.0,<7
 pygit2>=1.16.0,<2
 async-lru>=2.0.4,<3
 prometheus-client>=0.20.0,<1
-prometheus-async>=22.2.0,<23
+prometheus-async>=22.2.0,<26
 PyYAML>=6.0.2,<7
 jishaku>=2.6.0,<3
 watchfiles>=1.0.0,<2