Handle cryptography FFDH warnings

[gpotter2]

• this PR fixes Cryptography: handle FFDH deprecation #5037 and should allow Deprecate Diffie-Hellman over finite fields (FFDH) pyca/cryptography#15171 to pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.49%. Comparing base (7c953a7) to head (8018e66).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5061   +/-   ##
=======================================
  Coverage   80.48%   80.49%           
=======================================
  Files         390      390           
  Lines       96749    96758    +9     
=======================================
+ Hits        77873    77885   +12     
+ Misses      18876    18873    -3     

Files with missing lines	Coverage Δ
scapy/layers/tls/crypto/groups.py	95.74% <100.00%> (+0.12%)	⬆️
scapy/layers/tls/keyexchange.py	87.12% <100.00%> (+0.13%)	⬆️

... and 4 files with indirect coverage changes

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[alex]

Thanks @gpotter2 !