chore(deps): update dependency microsoft.sourcelink.github to v8

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.SourceLink.GitHub	1.1.1 -> 8.0.0

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Release Notes

dotnet/sourcelink (Microsoft.SourceLink.GitHub)

### [`v8.0.0`](https://redirect.github.com/dotnet/sourcelink/releases/tag/8.0.0): (.NET SDK 8.0.100) [Compare Source](https://redirect.github.com/dotnet/sourcelink/compare/1.1.1...8.0.0) #### What's Changed **Source Link is now included in .NET SDK 8 and enabled by default. Projects that migrate to .NET SDK 8 do not need to reference Source Link packages explicitly via `PackageReference` anymore.** - Add sparse checkout support by [@​pakrym](https://redirect.github.com/pakrym) in [https://github.com/dotnet/sourcelink/pull/772](https://redirect.github.com/dotnet/sourcelink/pull/772) - Add support for Gitee by [@​luocs](https://redirect.github.com/luocs) in [https://github.com/dotnet/sourcelink/pull/922](https://redirect.github.com/dotnet/sourcelink/pull/922) - Fix target Input Output as to not interfere with incremental. by [@​yuehuang010](https://redirect.github.com/yuehuang010) in [https://github.com/dotnet/sourcelink/pull/901](https://redirect.github.com/dotnet/sourcelink/pull/901) - Prepare for inclusion in .NET SDK by [@​tmat](https://redirect.github.com/tmat) in [https://github.com/dotnet/sourcelink/pull/988](https://redirect.github.com/dotnet/sourcelink/pull/988) - Avoid creating source link .json file when no source control mapping is available by [@​tmat](https://redirect.github.com/tmat) in [https://github.com/dotnet/sourcelink/pull/989](https://redirect.github.com/dotnet/sourcelink/pull/989) - Do not report warnings when SourceLink packages are not referenced ex… by [@​tmat](https://redirect.github.com/tmat) in [https://github.com/dotnet/sourcelink/pull/991](https://redirect.github.com/dotnet/sourcelink/pull/991) - Bump version to 8.0 to match SDK by [@​tmat](https://redirect.github.com/tmat) in [https://github.com/dotnet/sourcelink/pull/992](https://redirect.github.com/dotnet/sourcelink/pull/992) - Fix FileWrites by [@​tmat](https://redirect.github.com/tmat) in [https://github.com/dotnet/sourcelink/pull/995](https://redirect.github.com/dotnet/sourcelink/pull/995) - Remove unnecessary \

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[amanda-tarafa]

@jskeet just flagging this one, nut sure if its meant to be merged.

[jskeet]

Wow, somehow missed this for ages...