chore(deps): update _tunitpolyfillversion to 10.9.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Polyfill	nuget	minor	10.8.1 → 10.9.0

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Release Notes

SimonCropp/Polyfill (Polyfill)

v10.9.0

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This PR has been generated by Mend Renovate.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[claude]

This is a standard Renovate bot dependency update bumping the Polyfill package version from 10.8.1 to 10.9.0 in TUnit.Core/TUnit.Core.targets.

Change summary:

• Single-line version bump in <_TUnitPolyfillVersion> property inside TUnit.Core.targets
• The Polyfill package is a compile-time-only dependency (source generator/analyzer) injected automatically for netstandard2.0, netstandard2.1, and legacy .NETFramework targets
• PrivateAssets>all</PrivateAssets> ensures it does not leak into consuming projects' dependency graph

Assessment:
No architectural, correctness, or design concerns. The update is safe:

• Polyfill is a minor version bump (10.8.1 → 10.9.0), which by semver should be additive/non-breaking
• This package is compile-only (not runtime), so there is no AOT or runtime risk
• The _TUnitNeedsPolyfill condition correctly gates injection to older TFMs only, so net8/9/10 consumers are unaffected

Approving as a routine dependency maintenance change.

[claude]

Code Review

PR: chore(deps): update _tunitpolyfillversion to 10.9.0
Change: Single-line version bump in TUnit.Core/TUnit.Core.targets

Assessment: No issues found ✓

This is a clean minor dependency update from Polyfill 10.8.1 → 10.9.0 (SimonCropp/Polyfill). The change is exactly what it needs to be — one line, no risk.

Observations:

• The version string is pinned in a dedicated MSBuild property (_TUnitPolyfillVersion), which is the right pattern for a conditionally-included transitive dependency. Centralizing the version here makes future updates like this one trivial to review.
• The Polyfill package is only applied to netstandard2.0, netstandard2.1, and .NETFramework targets (as guarded by _TUnitNeedsPolyfill), so the blast radius for any regression from this bump is limited to legacy TFM consumers only.
• Codacy reports 0 new issues.

No concerns. Ready to merge.