Bump dnspython from 2.8.0 to 2.9.0

Bumps [dnspython](https://github.com/rthalley/dnspython) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/main/doc/whatsnew.rst)
- [Commits](rthalley/dnspython@v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: dnspython
  dependency-version: 2.9.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test_requirements.txt

@@ -8,7 +8,7 @@
 # messages may depend on package versions, so we pin versions
 # for reproducible testing.)
 coverage==7.13.5
-dnspython==2.8.0
+dnspython==2.9.0
 exceptiongroup==1.3.1
 flake8==7.3.0
 idna==3.15