Bump anyio from 4.9.0 to 4.12.1

Bumps [anyio](https://github.com/agronholm/anyio) from 4.9.0 to 4.12.1.
- [Release notes](https://github.com/agronholm/anyio/releases)
- [Commits](agronholm/anyio@4.9.0...4.12.1)

---
updated-dependencies:
- dependency-name: anyio
  dependency-version: 4.12.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

constraints.txt

@@ -1,5 +1,5 @@
 # Constraints generated by tools/freeze-constraints.sh
-anyio==4.9.0
+anyio==4.12.1
 Babel==2.12.1
 backports.ssl-match-hostname==3.7.0.1
 bcrypt==4.3.0