relax pydantic dependency (fixes #634)

[jpaniagualaconich]

Description

ValidationError is now imported from the "official" place.

Motivation and Context

Newer versions of py_webauthn also work with pydantic v2. We make use of the ValidationError symbol which fortunately is in the same path for both v1 and v2.

Fixes #634

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #650 (f9264f8) into master (08ef1b8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #650   +/-   ##
=======================================
  Coverage   95.38%   95.38%           
=======================================
  Files          75       75           
  Lines        3252     3252           
  Branches      372      372           
=======================================
  Hits         3102     3102           
  Misses        119      119           
  Partials       31       31           

Files Changed	Coverage Δ
two_factor/plugins/webauthn/forms.py	83.54% <100.00%> (ø)

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