[github-actions]

Bumps c2paVersion to v0.91.7.

Opened by the track/c2pa-rs-stable tracker after make library, make tests-with-server
and the full emulator matrix all passed against this version.

Left as a PR rather than auto-merged: a bump that compiles and tests clean can
still change signing behaviour.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.93%. Comparing base (953f914) to head (21349ed).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #157   +/-   ##
=========================================
  Coverage     71.93%   71.93%           
  Complexity       36       36           
=========================================
  Files            62       62           
  Lines          2362     2362           
  Branches        293      293           
=========================================
  Hits           1699     1699           
  Misses          495      495           
  Partials        168      168           

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