Bump dnspython from 1.16.0 to 2.1.0 in /backend

Bumps [dnspython](https://github.com/rthalley/dnspython) from 1.16.0 to 2.1.0.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/master/doc/whatsnew.rst)
- [Commits](https://github.com/rthalley/dnspython/compare/v1.16.0...v2.1.0)

---
updated-dependencies:
- dependency-name: dnspython
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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dependabot[bot] 2021-06-22 14:29:55 +00:00 committed by GitHub
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commit 85998b8a52
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@ -1,5 +1,5 @@
certifi==2021.5.30 certifi==2021.5.30
dnspython==1.16.0 dnspython==2.1.0
eventlet==0.31.0 eventlet==0.31.0
greenlet==1.1.0 greenlet==1.1.0
python-engineio==3.14.2 python-engineio==3.14.2