Bump urllib3 from 1.22 to 1.26.5

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.22 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.22...1.26.5)

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

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

requirements.txt

@@ -4,4 +4,4 @@ Flask-Script==2.0.5
 Flask-SQLAlchemy==2.1
 Flask-WTF==0.14.2
 Flask-Mail==0.9.1
-urllib3==1.22
+urllib3==1.26.5