chore: Rename ReplyOn::Failure to match variant from std

[jawoznia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.49%. Comparing base (3c89bcc) to head (d57d49f).
Report is 1 commits behind head on feat/replies.

Files with missing lines	Patch %	Lines
sylvia-derive/src/parser/attributes/msg.rs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           feat/replies     #449   +/-   ##
=============================================
  Coverage         72.49%   72.49%           
=============================================
  Files                62       62           
  Lines              3795     3795           
=============================================
  Hits               2751     2751           
  Misses             1044     1044           

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[hashedone]

LGTM, important change.