deps: Bump xunit from 2.7.1 to 2.9.3#14

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dependabot/nuget/bindings/dotnet/tests/Photostax.Tests/xunit-2.9.3JeromySt/photostax:dependabot/nuget/bindings/dotnet/tests/Photostax.Tests/xunit-2.9.3Copy head branch name to clipboard