Bump flask from 1.0 to 1.1.1 in /densecap/webcam

Bumps [flask](https://github.com/pallets/flask) from 1.0 to 1.1.1.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/master/CHANGES.rst)
- [Commits](pallets/flask@1.0...1.1.1)

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

densecap/webcam/requirements.txt

@@ -1,4 +1,4 @@
-Flask==1.0
+Flask==1.1.1
 Flask-Cors==2.1.2
 Flask-RESTful==0.3.5
 Jinja2==2.8