Bump rsa from 4.0 to 4.7

Bumps [rsa](https://github.com/sybrenstuvel/python-rsa) from 4.0 to 4.7.
- [Release notes](https://github.com/sybrenstuvel/python-rsa/releases)
- [Changelog](https://github.com/sybrenstuvel/python-rsa/blob/main/CHANGELOG.md)
- [Commits](sybrenstuvel/python-rsa@version-4.0...version-4.7)

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

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

Author: dependabot[bot]

web/requirements.txt

@@ -2,5 +2,5 @@ Flask==1.1.1
 Flask-Markdown==0.3
 mysql-connector-python==8.0.19
 colorlog==4.1.0
-rsa==4.0
+rsa==4.7
 pyScss==1.3.7