Cryptography fixes

[jschlyter]

• remove deprecated cryptography backend arguments
• pass curve as instance and always pass as keyword argument
• bump version to 1.9.1

closes #157

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 76.17%. Comparing base (1e79713) to head (0ee8d4a).
Report is 9 commits behind head on main.

Files	Patch %	Lines
src/cryptojwt/jwk/rsa.py	75.00%	1 Missing ⚠️
src/cryptojwt/jwk/x509.py	80.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
- Coverage   76.22%   76.17%   -0.06%     
==========================================
  Files          44       44              
  Lines        4745     4735      -10     
  Branches     1000     1000              
==========================================
- Hits         3617     3607      -10     
  Misses        823      823              
  Partials      305      305              

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[jschlyter]

@rohe could you take a look at installing the Codecov app?

[rohe]

Will have a look at Codecov