⬆️ Update anyio requirement from ~=4.8.0 to ~=4.9.0

Updates the requirements on [anyio](https://github.com/agronholm/anyio) to permit the latest version.
- [Release notes](https://github.com/agronholm/anyio/releases)
- [Changelog](https://github.com/agronholm/anyio/blob/master/docs/versionhistory.rst)
- [Commits](agronholm/anyio@4.8.0...4.9.0)

---
updated-dependencies:
- dependency-name: anyio
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements.dev.txt

@@ -1,4 +1,4 @@
-anyio~=4.8.0
+anyio~=4.9.0
 autoflake~=2.3.1
 black~=25.1.0
 isort~=6.0.0