Build(deps): Bump dnspython from 1.16.0 to 2.6.1

Bumps [dnspython](https://github.com/rthalley/dnspython) from 1.16.0 to 2.6.1.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/main/doc/whatsnew.rst)
- [Commits](rthalley/dnspython@v1.16.0...v2.6.1)

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

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

requirements.txt

@@ -3,7 +3,7 @@ cryptography==3.3.2; python_version == '2.7'
 cryptography==39.0.1; python_version > '2.7' and python_version < '3.6'
 cryptography==40.0.2; python_version >= '3.6' and python_version < '3.7'
 cryptography==42.0.3; python_version >= '3.7'
-dnspython==1.16.0
+dnspython==2.6.1
 enum34==1.1.10
 future==0.18.3
 ipaddress==1.0.23