Update SixLabors.ImageSharp.Drawing.WebGPU.targets

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86%. Comparing base (4f46a16) to head (ed8d557).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #394   +/-   ##
===================================
  Coverage    86%    86%           
===================================
  Files       109    109           
  Lines      9052   9052           
  Branches   1085   1085           
===================================
  Hits       7820   7820           
  Misses      982    982           
  Partials    250    250           

Flag	Coverage Δ
unittests	86% <ø> (ø)

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