build(deps): Bump urllib3 in /zstackbuild/pypi_source

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.10.4 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.10.4...1.26.5)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

zstackbuild/pypi_source/requirements.txt

@@ -26,7 +26,7 @@ Routes==2.1
 simplejson==3.7.3
 six==1.9.0
 termcolor==1.1.0
-urllib3==1.10.4
+urllib3==1.26.5
 virtualenv==12.1.1
 websockify==0.6.1
 Werkzeug==0.10.4