build(deps): bump idna from 3.4 to 3.7 in /backend (#167)

Bumps [idna](https://github.com/kjd/idna) from 3.4 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.4...v3.7)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/requirements.txt

@@ -12,7 +12,7 @@ fastapi==0.110.1
 fastkml==0.12
 greenlet==3.0.0
 h11==0.14.0
-idna==3.4
+idna==3.7
 iniconfig==2.0.0
 isort==5.12.0
 lazy-object-proxy==1.9.0