Upgrade Werkzeug to address CVE
Upgrade Werkzeug to address CVE

Upgrade to the latest version of Werkzeug, which includes the fix for
CVE-2019-14806[1]. As this project does not use Docker, and does not use
the debugger in production, I believe it was not impacted by the CVE.

The other changes[2] don't seem to require any code changes.

[1] https://nvd.nist.gov/vuln/detail/CVE-2019-14806
[2] https://werkzeug.palletsprojects.com/en/0.16.x/changes/#version-0-16-0

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