chore(deps): update dependency polyfill to 10.5.1

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Polyfill	nuget	patch	10.5.0 → 10.5.1

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Release Notes

SimonCropp/Polyfill (Polyfill)

v10.5.1

Compare Source

• #​546 Make range a readonly record struct to match bcl

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[codacy-production]

Up to standards ✅

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[claude]

Code Review

This is a clean, minimal patch-version dependency bump for the Polyfill package: 10.5.0 → 10.5.1.

Change: Single version string update in TUnit.Core/TUnit.Core.targets.

Assessment:

• The change is exactly what it should be — one line, no risk of unintended scope creep.
• The upstream release note for v10.5.1 notes: "Make range a readonly record struct to match BCL" — a correctness/alignment fix with no breaking API changes.
• Patch bumps for a compile-time polyfill source generator carry essentially zero runtime risk.

No issues found. Good to merge.