Bump to v0.19.2-rc.0

[moCello]

Added

• Add zeroize as an optional dependency [Implement Zeroize for Witness #818]
• Add zeroize feature [Implement Zeroize for Witness #818]
• Add Zeroize trait implementation for Witness behind zeroize feature [Implement Zeroize for Witness #818]

This rc release outside of the release schedule is needed for being able to open poseidon for audit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.32%. Comparing base (8f88f7e) to head (1c76596).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #821   +/-   ##
=======================================
  Coverage   85.32%   85.32%           
=======================================
  Files          57       57           
  Lines        3687     3687           
=======================================
  Hits         3146     3146           
  Misses        541      541           

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