Refresh package versions

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Newest stable versions on nuget.org (plan 15.2).

Package	From	To
Avalonia.Headless.NUnit	12.1.3	12.1.4
Avalonia.Headless.XUnit	12.1.3	12.1.4
Avalonia.Skia	12.1.3	12.1.4
Avalonia.Themes.Fluent	12.1.3	12.1.4
DiffEngineTray	20.7.2	20.8.1
EfLocalDb	27.2.3	27.2.5
EfLocalDb.MSTest	27.2.3	27.2.5
EfLocalDb.NUnit	27.2.3	27.2.5
EfLocalDb.TUnit	27.2.3	27.2.5
EfLocalDb.Xunit.V3	27.2.3	27.2.5
Expecto	11.1.0	11.1.1
Morph.ImageSharp	1.21.0	1.22.0
Morph.Skia	1.21.0	1.22.0
NUnit3TestAdapter	6.3.0	6.3.1
TUnit	1.73.19	1.74.0
Verify	33.3.2	33.3.3
Verify.EntityFramework	16.0.0	16.1.2
Verify.EntityFrameworkClassic	16.0.0	16.1.2
Verify.Expecto	33.3.2	33.3.3
Verify.Fixie	33.3.2	33.3.3
Verify.MSTest	33.3.2	33.3.3
Verify.NUnit	33.3.2	33.3.3
Verify.SqlServer	12.2.0	12.3.2
Verify.TUnit	33.3.2	33.3.3
Verify.XunitV3	33.3.2	33.3.3
WolverineFx	6.48.2	6.49.0
xunit.v3	4.0.1	4.0.2

Every generated solution builds with these versions, and the core solutions pass their tests.