build(deps): 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: direct:production
...

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

requirements.txt

@@ -38,7 +38,7 @@ Flask-SQLAlchemy==2.5.1
 Flask-SQLAlchemy-Session==1.1
 Flask-WTF==0.14.2
 ghdiff==0.4
-idna==3.3
+idna==3.7
 imagesize==1.3.0
 isort==4.3.4
 itsdangerous==0.24