Bump pyopenssl from 17.2.0 to 17.5.0

Bumps [pyopenssl](https://github.com/pyca/pyopenssl) from 17.2.0 to 17.5.0.
- [Release notes](https://github.com/pyca/pyopenssl/releases)
- [Changelog](https://github.com/pyca/pyopenssl/blob/master/CHANGELOG.rst)
- [Commits](pyca/pyopenssl@17.2.0...17.5.0)

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

requirements.txt

@@ -103,7 +103,7 @@ Pygments==2.2.0
 PyJWT==1.7.1
 pylibmc==1.5.2
 pylint==1.9.5
-pyOpenSSL==17.2.0
+pyOpenSSL==17.5.0
 pyparsing==2.2.0
 pytest==2.7.0
 pytest-cov==2.5.1