Bump paramiko from 2.6.0 to 2.7.1

Bumps [paramiko](https://github.com/paramiko/paramiko) from 2.6.0 to 2.7.1.
- [Release notes](https://github.com/paramiko/paramiko/releases)
- [Changelog](https://github.com/paramiko/paramiko/blob/master/NEWS)
- [Commits](https://github.com/paramiko/paramiko/compare/2.6.0...2.7.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

requirements.txt

@@ -13,7 +13,7 @@ functools32==3.2.3.post2; python_version < '3.2'
 idna==2.8
 ipaddress==1.0.18
 jsonschema==3.2.0
-paramiko==2.6.0
+paramiko==2.7.1
 pypiwin32==219; sys_platform == 'win32' and python_version < '3.6'
 pypiwin32==223; sys_platform == 'win32' and python_version >= '3.6'
 PySocks==1.7.1