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>

requirements-dev.txt

@@ -105,7 +105,7 @@ traitlets==5.0.5
 twine==3.2.0
 typed-ast==1.4.1
 typing-extensions==3.7.4.3
-urllib3==1.26.3
+urllib3==1.26.4
 virtualenv==20.2.1
 wcwidth==0.2.5
 webencodings==0.5.1

requirements-test.txt

@@ -16,7 +16,7 @@ PyYAML==5.4
 s3fs==0.4.2
 s3transfer==0.3.4
 six==1.15.0
-urllib3==1.26.3
+urllib3==1.26.4
 coverage==5.4
 whylabs-datasketches==2.2.0b1
 freezegun==1.1.0

requirements.txt

@@ -13,7 +13,7 @@ pytz==2020.5
 PyYAML==5.4
 s3transfer==0.3.3
 six==1.15.0
-urllib3==1.26.3
+urllib3==1.26.4
 whylabs-datasketches==2.2.0b1
 xlrd==2.0.1
 openpyxl==3.0.6