Ignore Roslyn package bumps in Dependabot

[oschwald]

The source generator pins Microsoft.CodeAnalysis.CSharp to the lowest version that provides the APIs it uses, so consumers on older .NET SDKs can still load it. Dependabot bumps to the Roslyn packages raise that floor, so this ignores Microsoft.CodeAnalysis.CSharp and Microsoft.CodeAnalysis.Analyzers in the NuGet update config. Both are updated by hand from now on.

This replaces #361.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Adjusted automated maintenance settings to exclude selected items from routine update checks.
  • This is an internal maintenance change and does not affect product features or behavior visible to end users. No other user-facing changes are included in this release.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: b08c22e8-53e2-475b-8ec7-87018204abc1

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📥 Commits

Reviewing files that changed from the base of the PR and between 493301d and 79c1d4a.

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📒 Files selected for processing (1)

• .github/dependabot.yml

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📝 Walkthrough

Walkthrough

The Dependabot NuGet configuration now ignores updates to Microsoft.CodeAnalysis.CSharp and Microsoft.CodeAnalysis.Analyzers. A comment describes the manual-update policy for these packages.

Changes

NuGet Update Policy

Layer / File(s)	Summary
Dependabot ignore rules .github/dependabot.yml	Adds a comment about manual updates and configures Dependabot to ignore updates to the two specified packages.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Suggested reviewers: horgh

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Merge Risk: ⚪ Minimal · up to 79c1d

The configuration implements the stated manual-update policy. It is ready to merge after normal checks; maintainers should ensure their manual process includes security alerts.

Pre-merge checks | 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: configuring Dependabot to ignore Roslyn package bumps.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

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_{A rabbit checks the package list,
Two updates hop away.
A note says they are changed by hand,
So Dependabot lets them stay.
The config rests in quiet order,
And I nibble clover by the bay.}

_{Comment @coderabbitai help to get the list of available commands.}