[repo-assist] deps: bump fantomas to 8.0.0 stable and Microsoft.NET.Test.Sdk to 18.10.1

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Protected files: Directory.Packages.props, .config/dotnet-tools.json

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Summary

Applies two safe dependency bumps, superseding the currently-open Dependabot PR #1334 ("Bump the nuget group with 2 updates"):

• fantomas (dotnet tool) 8.0.0-beta-002 → 8.0.0 (the stable release; the beta line has no relevant behavioural changes per the fantomas 8.0.0 changelog).
• Microsoft.NET.Test.Sdk 18.10.0 → 18.10.1 (patch release).

Once this merges, maintainers can close #1334 and its Dependabot companion.

Test Status

• ✅ dotnet fantomas build.fsx src tests docs --check — clean with the new fantomas 8.0.0, no reformatting required anywhere in the repo.
• ✅ dotnet build FSharp.Formatting.sln -c Release — 0 warnings, 0 errors.
• ✅ dotnet test FSharp.Formatting.sln -c Release — all 701 tests pass (375 FSharp.Markdown.Tests, 45 FSharp.CodeFormat.Tests, 31 fsdocs-tool.Tests, 146 FSharp.Literate.Tests, 100 FSharp.ApiDocs.Tests + 4 skipped).

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Protected files were modified in this pull request and require manual scrutiny before merge.

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• Protected files: Directory.Packages.props, .config/dotnet-tools.json

[nojaf]

/repo-assist this does not require a release note.
Also why are you raising these, don't we have dependabot?

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[github-actions]

🤖 This is an automated response from Repo Assist.

Thanks for the feedback! I've removed the RELEASE_NOTES.md entry from this PR.

On Dependabot: yes, this repo does have Dependabot enabled, and it had already opened #1334 for the same nuget updates. This PR was created to also bump the fantomas dotnet-tool version pinned in .config/dotnet-tools.json (which Dependabot's nuget grouping doesn't cover) alongside the Microsoft.NET.Test.Sdk bump, and to verify both together (build/format/test) before merge, superseding #1334. Since that duplicates work Dependabot already does for the package bump, feel free to close this PR and let #1334 (plus a manual fantomas bump if desired) handle it instead — happy to close it myself if you'd prefer.

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