Bump urllib3 from 1.26.3 to 1.26.4

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.3 to 1.26.4. - [Release notes](https://github.com/urllib3/urllib3/releases) - [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst) - [Commits](urllib3/urllib3@1.26.3...1.26.4) Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -28,7 +28,7 @@ six==1.15.0
 toml==0.10.2
 typed-ast==1.4.2
 typing-extensions==3.7.4.3
-urllib3==1.26.3
+urllib3==1.26.4
 wrapt==1.12.1
 pytest
 pytest-cov

requirements.txt

@@ -2,5 +2,5 @@ ddt==1.4.1
 numpy==1.19.5
 pywin32==300
 selenium==3.141.0
-urllib3==1.26.3
+urllib3==1.26.4
 requests==2.25.1