Bump idna from 3.3 to 3.7

Bumps [idna](https://github.com/kjd/idna) from 3.3 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.3...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: indirect
...

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

requirements.txt

@@ -8,16 +8,12 @@ alabaster==0.7.12
     # via sphinx
 babel==2.9.1
     # via sphinx
-backports.entry-points-selectable==1.1.0
+backports-entry-points-selectable==1.1.0
     # via virtualenv
 certifi==2021.10.8
     # via requests
 charset-normalizer==2.0.7
     # via requests
-colorama==0.4.4
-    # via
-    #   sphinx
-    #   tox
 commonmark==0.9.1
     # via recommonmark
 distlib==0.3.3
@@ -31,7 +27,7 @@ filelock==3.3.1
     # via
     #   tox
     #   virtualenv
-idna==3.3
+idna==3.7
     # via requests
 imagesize==1.2.0
     # via sphinx