default to SHA2-512 for RSA signature

[ddebin]

⚠️ Breaking change: default to SHA2-512 signature for RSA keys, making it incompatible with previous encrypted data. If you use RSA keys, you should migrate to this new encryption, as default SHA-1 signatures are deprecated.

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (413b7f2) to head (d16e0d5).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          155       157    +2     
  Branches        22        23    +1     
=========================================
+ Hits           155       157    +2     

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