Bump rsa from 4.0 to 4.1

Bumps [rsa](https://github.com/sybrenstuvel/python-rsa) from 4.0 to 4.1.
- [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-4.1)

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

Author: dependabot[bot]

requirements.txt

@@ -72,7 +72,7 @@ PyYAML==5.1.2
 regex==2020.1.8
 requests==2.22.0
 requests-oauthlib==1.3.0
-rsa==4.0
+rsa==4.1
 sendgrid==6.1.2
 six==1.13.0
 soupsieve==1.9.5