Update ImageSharp.Tests.ProfilingSandbox.csproj

[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 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

There's a breaking change in the .NET SDK 5.300 that affects our sandbox reference. This PR disables the check so we can build the solution. (I would like to delete the sandbox one day, we can profile using our Rider licenses)

See dotnet/docs#24231 for more info.

[codecov]

Codecov Report

Merging #1636 (93f2322) into master (a29653f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1636   +/-   ##
=======================================
  Coverage   84.09%   84.09%           
=======================================
  Files         812      812           
  Lines       35594    35594           
  Branches     4144     4144           
=======================================
  Hits        29933    29933           
  Misses       4842     4842           
  Partials      819      819           

Flag	Coverage Δ
unittests	84.09% <ø> (ø)

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