ci: make Dependabot PRs merge-ready

[thedavidweng]

Why

Recent Dependabot PRs were blocked by unrelated CI:

• pnpm audit --audit-level=high failed on transitive undici / nanoid
• CodeQL init and analyze were bumped in separate PRs and rejected a version mismatch
• release.yml used unpinned action tags, so the pnpm-setup bump tripped zizmor

What

• Override patched undici 7.29.0 and nanoid 3.3.17 in pnpm-workspace.yaml
• Bump all github/codeql-action/* refs together and group future Dependabot updates
• Pin release workflow actions and bump pnpm/action-setup to 6.0.10
• Enable auto-merge for patch updates and non-production minors

Supersedes #192, #194, #195.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

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Run ID: 255be7b2-7851-42ad-b216-00aa03bc4874

📥 Commits

Reviewing files that changed from the base of the PR and between 59774b7 and e49401b.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (7)

• .github/dependabot.yml
• .github/workflows/ci.yml
• .github/workflows/codeql.yml
• .github/workflows/dependabot-automerge.yml
• .github/workflows/dependabot-fmt.yml
• .github/workflows/release.yml
• pnpm-workspace.yaml

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