Update dependency urllib3 to v1.26.8

Author: renovate-bot

requirements.txt

@@ -17,7 +17,7 @@ requests==2.26.0; (python_version >= "2.7" and python_full_version < "3.0.0") or
 six==1.16.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
 tenacity==8.0.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
 text-unidecode==1.3; python_version >= "3.6"
-urllib3==1.26.6; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version < "4"
+urllib3==1.26.8; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version < "4"
 uwsgi==2.0.20
 webassets==2.0
 werkzeug==2.0.1; python_version >= "3.6"