Wallet: deprecate old h2c

[callebtc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.60656% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 68.83%. Comparing base (a546a24) to head (d048037).
Report is 5 commits behind head on main.

Files	Patch %	Lines
cashu/core/crypto/b_dhke.py	75.00%	6 Missing ⚠️
cashu/mint/migrations.py	92.59%	2 Missing ⚠️
cashu/wallet/wallet.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   68.91%   68.83%   -0.09%     
==========================================
  Files          74       74              
  Lines        6618     6633      +15     
==========================================
+ Hits         4561     4566       +5     
- Misses       2057     2067      +10     

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