Update werkzeug requirement from <0.17,>=0.16 to >=0.16,<3.1

Updates the requirements on [werkzeug](https://github.com/pallets/werkzeug) to permit the latest version.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](pallets/werkzeug@0.16.0...3.0.4)

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

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

requirements.txt

@@ -10,7 +10,7 @@ requests>=2.22,<2.23  # https://pypi.python.org/pypi/requests
 gevent==20.12.0  # http://www.gevent.org/changelog.html
 # Limit greenlet version for binary compatibility with gevent 20.12 wheels
 greenlet==1.0.0
-werkzeug>=0.16,<0.17  # https://github.com/pallets/werkzeug/blob/master/CHANGES
+werkzeug>=0.16,<3.1  # https://github.com/pallets/werkzeug/blob/master/CHANGES
 patool>=1.12,<1.13  # https://github.com/wummel/patool/blob/master/doc/changelog.txt
 bcrypt>=3.1,<3.2  # https://github.com/pyca/bcrypt/
 chardet>=3.0,<3.1  # https://pypi.python.org/pypi/chardet