Bump rsa from 4.5 to 4.7 in /docs

Bumps [rsa](https://github.com/sybrenstuvel/python-rsa) from 4.5 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-4.5...version-4.7)

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