Bump ILSpy-tests: isolate fixtures from host warnings-as-errors

Pull in the submodule's new root Directory.Build.props so the decompiler test fixtures aren't subject to this repo's TreatWarningsAsErrors=true. Assisted-by: Claude:claude-opus-4-8:Claude Code
4 weeks ago · 5635852cdf
1 changed files with 1 additions and 1 deletions
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-Subproject commit 6cc4bb2942a1c6a134510ad4d916f77604d37b51
+Subproject commit 4ccc3f0108007242c95025590edd4cc6ef1fb731