Merge pull request #7345 from docker/dependabot/pip/certifi-2020.4.5.1

Bump certifi from 2019.11.28 to 2020.4.5.1

requirements.txt

@@ -1,7 +1,7 @@
 backports.shutil_get_terminal_size==1.0.0
 backports.ssl-match-hostname==3.5.0.1; python_version < '3'
 cached-property==1.5.1
-certifi==2019.11.28
+certifi==2020.4.5.1
 chardet==3.0.4
 colorama==0.4.3; sys_platform == 'win32'
 distro==1.5.0