Nut07/proof pending

[callebtc]

Mint: adds new proof state pending in POST /check response.

Addresses NUT-07 update cashubtc/nuts#21

• Bump version to 0.12.3
• Wallet: fix cashu burn, didn't load_proofs

[codecov]

Codecov Report

Patch coverage: 52.00% and project coverage change: -0.28 ⚠️

Comparison is base (5604059) 56.59% compared to head (ea70849) 56.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #277      +/-   ##
==========================================
- Coverage   56.59%   56.32%   -0.28%     
==========================================
  Files          43       43              
  Lines        3541     3551      +10     
==========================================
- Hits         2004     2000       -4     
- Misses       1537     1551      +14     

Impacted Files	Coverage Δ
cashu/mint/router.py	0.00% <0.00%> (ø)
cashu/wallet/cli/cli.py	49.39% <0.00%> (-0.13%)	⬇️
setup.py	0.00% <ø> (ø)
cashu/mint/ledger.py	32.82% <30.00%> (-0.34%)	⬇️
cashu/core/base.py	94.11% <100.00%> (+0.02%)	⬆️
cashu/core/settings.py	96.38% <100.00%> (ø)
cashu/wallet/wallet.py	82.73% <100.00%> (ø)

... and 1 file with indirect coverage changes

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