Bump dnspython from 2.1.0 to 2.6.1 in /jsk_perception/docker/ofa

Bumps [dnspython](https://github.com/rthalley/dnspython) from 2.1.0 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@v2.1.0...v2.6.1)

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

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

jsk_perception/docker/ofa/requirements.txt

@@ -18,7 +18,7 @@ cycler==0.11.0
 Cython==0.29.33
 datasets==2.11.0
 dill==0.3.6
-dnspython==2.1.0
+dnspython==2.6.1
 einops==0.6.0
 Flask==2.2.3
 fonttools==4.39.3