bump version to 0.12.1

[callebtc]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a3e67d2) 56.32% compared to head (0042c1f) 56.32%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #258   +/-   ##
=======================================
  Coverage   56.32%   56.32%           
=======================================
  Files          42       42           
  Lines        3320     3320           
=======================================
  Hits         1870     1870           
  Misses       1450     1450           

Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)
cashu/core/settings.py	97.43% <100.00%> (ø)

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