deps: update github.com/dadrus/httpsig digest to 6cb9b82

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/dadrus/httpsig	require	digest	ede02f5 -> 6cb9b82

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.43%. Comparing base (aa3241f) to head (a6b205b).

Additional details and impacted files

@@           Coverage Diff            @@
##           release    #2108   +/-   ##
========================================
  Coverage    89.43%   89.43%           
========================================
  Files          271      271           
  Lines        11467    11467           
========================================
  Hits         10256    10256           
  Misses         970      970           
  Partials       241      241           

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