Fix Werkzeug DeprecationWarning

[compyman]

Description of the change

This PR changes the flask integration setup to import Request instead of BaseRequest from Werkzeug.

This is motivated by the deprecation warning I'm receiving that says:

{pyenv_dir}/site-packages/rollbar/__init__.py:1160: DeprecationWarning: 'BaseRequest' is deprecated and will be removed in Werkzeug 2.1. Use 'isinstance(obj, Request)' instead.
if WerkzeugRequest and isinstance(request, WerkzeugRequest):

All the tests pass, and I can't on the face of it see a reason to prefer BaseRequest over Request generally

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

Checklists

Development

• Lint rules pass locally
  My flake8 does not pass locally, but none of those are related to this change
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers assigned
• Issue from task tracker has a link to this pull request
• Changes have been reviewed by at least one other engineer

[nk9]

This is showing up in my unit tests as a warning whenever I run them. Would love to see this PR accepted so I can get back to the land of green. 😄

[danielmorell]

Thank you @compyman for bringing this to our attention!