Bump urllib3 from 1.26.2 to 1.26.4 in /python

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.2 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@1.26.2...1.26.4)

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

Author: dependabot[bot]

python/requirements.txt

@@ -2,4 +2,4 @@ certifi==2020.11.8
 chardet==3.0.4
 idna==2.10
 requests==2.25.0
-urllib3==1.26.2
+urllib3==1.26.4

python/setup.py

@@ -45,7 +45,7 @@
         'chardet==3.0.4',
         'idna==2.10',
         'requests==2.25.0',
-        'urllib3==1.26.2',
+        'urllib3==1.26.4',
     ],
     entry_points={
         "console_scripts": [