Bump rsa from 4.0 to 4.7 in /updater

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] <[email protected]>

Author: dependabot[bot]

updater/requirements.txt

@@ -16,7 +16,7 @@ pyasn1-modules==0.2.8
 pytz==2019.3
 requests==2.23.0
 requests-oauthlib==1.3.0
-rsa==4.0
+rsa==4.7
 six==1.14.0
 uritemplate==3.0.1
 urllib3==1.25.8