deps: update github.com/dadrus/httpsig digest to fd2c881

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/dadrus/httpsig	require	digest	ae64249 -> fd2c881

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.44%. Comparing base (bb3ccaa) to head (02c4b7e).

Additional details and impacted files

@@           Coverage Diff            @@
##           release    #1936   +/-   ##
========================================
  Coverage    89.44%   89.44%           
========================================
  Files          271      271           
  Lines        11470    11470           
========================================
  Hits         10259    10259           
  Misses         970      970           
  Partials       241      241           

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