Bump urllib3 from 1.26.3 to 1.26.4 (sanderland#407)

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>

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

requirements.txt

@@ -9,4 +9,4 @@ kivymd==0.104.1
 Pillow==8.1.1
 Pygments==2.7.4
 requests==2.25.0
-urllib3==1.26.3
+urllib3==1.26.4