Bump idna from 2.9 to 3.7

Bumps [idna](https://github.com/kjd/idna) from 2.9 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.9...v3.7)

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

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

requirements.txt

@@ -18,7 +18,7 @@ google-pasta==0.2.0
 grpcio==1.30.0
 h5py==2.10.0
 hdbscan==0.8.26
-idna==2.9
+idna==3.7
 imageio==2.8.0
 importlab==0.5.1
 importlib-metadata==1.6.1