Add changelog for Wasmi v0.42.1

[Robbepop]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.56%. Comparing base (6735bf9) to head (d67d997).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1402      +/-   ##
==========================================
+ Coverage   70.52%   70.56%   +0.04%     
==========================================
  Files         157      157              
  Lines       14414    14414              
==========================================
+ Hits        10165    10171       +6     
+ Misses       4249     4243       -6     

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