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)

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

requirements.txt

@@ -6,7 +6,7 @@ google-auth==1.6.3
 httplib2==0.12.1
 pyasn1-modules==0.2.4
 pyasn1==0.4.5
-rsa==4.0
+rsa==4.7
 six==1.12.0
 uritemplate==3.0.0
 tqdm==4.64.1