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/1.26.4/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.26.3...1.26.4)

Signed-off-by: dependabot[bot] <support@github.com>

automated_detection_testing/requirements.txt

@@ -14,7 +14,7 @@ azure-mgmt-network==18.0.0
 azure-mgmt-resource==16.0.0
 bcrypt==3.2.0
 boto3==1.16.62
-botocore==1.20.0
+botocore==1.20.29
 certifi==2020.12.5
 cffi==1.14.5
 cfgv==2.0.1
@@ -73,7 +73,7 @@ splunk-sdk==1.6.15
 tabulate==0.8.9
 termcolor==1.1.0
 toml==0.10.2
-urllib3==1.26.3
+urllib3==1.26.4
 virtualenv==20.4.3
 wcwidth==0.2.5
 wget==3.2

requirements.txt

@@ -44,7 +44,7 @@ stix2-patterns==1.2.1
 taxii2-client==2.2.2
 toml==0.10.2
 typing==3.7.4.3
-urllib3==1.26.3
+urllib3==1.26.4
 virtualenv==20.4.3
 wcwidth==0.2.5
 zipp==3.4.1