chore(deps): update dependency polyfill to 9.7.7

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Polyfill	nuget	patch	9.7.6 → 9.7.7

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Release Notes

SimonCropp/Polyfill (Polyfill)

v9.7.7

Compare Source

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Configuration

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🚦 Automerge: Enabled.

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This PR has been generated by Renovate Bot.

[thomhurst]

Summary

Updates Polyfill dependency from 9.7.6 to 9.7.7 (patch version bump).

Critical Issues

None found ✅

Analysis

This PR updates the Polyfill package version in TUnit.Core.targets:11. The change is:

• Single line modification (build configuration file)
• Patch version update (9.7.6 → 9.7.7) - typically contains bug fixes only
• Does NOT touch source generator, test discovery, public APIs, or hot paths
• No TUnit-specific rules apply to this change

The modified file controls automatic Polyfill package injection for projects targeting netstandard2.0/2.1 and .NET Framework. This is a build-time dependency that provides compile-time polyfills for newer C# features.

No snapshot updates required - this change doesn't affect source generator output or public APIs.

Verdict

✅ APPROVE - No critical issues

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Automated dependency updates like this are low-risk when they're patch versions from trusted sources.