Bump idna from 2.8 to 3.7 in /VC+/scripts

Bumps [idna](https://github.com/kjd/idna) from 2.8 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.8...v3.7)

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

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

Author: dependabot[bot]

VC+/scripts/requirements.txt

@@ -39,7 +39,7 @@ future==0.18.3
 httplib2==0.19.0
 humanfriendly==10.0
 hyperlink==19.0.0
-idna==2.8
+idna==3.7
 importlib-metadata==1.5.0
 incremental==16.10.1
 iso8601==1.1.0