Fix doctype in test_frontend.py for Werkzeug >= 2.1.2 #1325
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doctype string has been changed to lowercase in Werkzeug 2.1.2, see
https://github.com/pallets/werkzeug/pull/2391/files
The if statement in line 42 is a workaround to allow all versions and can be removed when 2.1.2 is minimum version in setup.py.
Prepare for Werkzeug 2.x and related to #1109.