update nuget

[shimat]

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[Copilot]

Pull request overview

This PR updates NuGet dependencies (notably migrating tests to xUnit v3) and adjusts the test suite to use xUnit’s built-in conditional skipping instead of a custom platform-specific attribute.

Changes:

• Upgrade test infrastructure packages (Microsoft.NET.Test.Sdk, xUnit runner, xUnit v3, StaFact) and switch test projects to OutputType=Exe.
• Replace PlatformSpecificFact usage with [Fact(..., SkipUnless = ...)] and add OS-detection helpers.
• Minor test code cleanups (remove no-longer-needed usings, tighten assertions in FileStorage test).

Reviewed changes

Copilot reviewed 35 out of 35 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
test/OpenCvSharp.Tests/xphoto/XPhotoTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/ximgproc/SuperpixelTest.cs	Replaces platform-specific attribute with SkipUnless-based Fact; adds OS check helper.
test/OpenCvSharp.Tests/xfeatures2d/SURFTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/wechat_qrcode/WeChatQRCodeTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/videoio/VideoWriterTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/videoio/VideoCaptureTest.cs	Converts platform-specific facts to SkipUnless and adds OS checks.
test/OpenCvSharp.Tests/text/OCRTesseractTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/system/AppDomainTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/stitching/StitchingTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/stitching/CvDetailTest.cs	Converts platform-specific fact to SkipUnless and adds OS checks.
test/OpenCvSharp.Tests/ml/ANN_MLPTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/imgcodecs/ImgCodecsTest.cs	Adds OS check and converts Windows-only tests to SkipUnless.
test/OpenCvSharp.Tests/features2d/SIFTTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/features2d/ORBTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/features2d/FastFeatureDetectorTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/features2d/BOWImgDescriptorExtractorTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/face/LBPHFaceRecognizerTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/dnn/YoloTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/dnn/TensorflowTest.cs	Converts platform-specific facts to SkipUnless and adds OS checks.
test/OpenCvSharp.Tests/dnn/NetTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/dnn/EastTextDetectionTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/dnn/CaffeTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/core/UtilityTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/core/SolveEquationTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/core/MatTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/core/FileStorageTest.cs	Makes FileNode null checks explicit before reading Mats.
test/OpenCvSharp.Tests/calib3d/Calib3dTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
test/OpenCvSharp.Tests/TestBase.cs	Adds shared OS-detection properties for SkipUnless.
test/OpenCvSharp.Tests/PlatformSpecificFactAttribute.cs	Deletes the custom platform-specific xUnit attribute implementation.
test/OpenCvSharp.Tests/OpenCvSharp.Tests.csproj	Updates test NuGets and switches test output type to Exe.
test/OpenCvSharp.Tests.Windows/OpenCvSharp.Tests.Windows.csproj	Updates test NuGets and switches test output type to Exe.
test/OpenCvSharp.Tests.Windows/BitmapConverterTest.cs	Removes xUnit Abstractions using as part of xUnit v3 migration.
src/OpenCvSharp/OpenCvSharp.csproj	Updates SourceLink GitHub package version.
src/OpenCvSharp.WpfExtensions/OpenCvSharp.WpfExtensions.csproj	Updates System.Drawing.Common package version.
src/OpenCvSharp.Extensions/OpenCvSharp.Extensions.csproj	Updates System.Drawing.Common and SourceLink GitHub package versions.

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