Bump urllib3 from 1.26.2 to 1.26.4 (#5)

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]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 requests==2.25.1
-urllib3==1.26.2
+urllib3==1.26.4
 boto3==1.17.57
 botocore==1.20.57
 aws-requests-auth==0.4.3