chore(ci): queue release-please runs instead of letting them overlap

[yordis]

• Merging release PRs back to back can start overlapping release-please runs that race on the same merged PRs, risking failed or duplicate tags and releases.
• Runs must wait in order rather than be cancelled, because each merge is meant to ship its own plugin release independently.

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[cursor]

PR Summary

Low Risk
CI-only workflow concurrency change; no application or release-token logic is modified.

Overview
Adds a concurrency policy to the Release Please workflow so pushes to main no longer start overlapping runs.

Runs share the release-please group with cancel-in-progress: false and queue: max, so a new trigger waits for the current job to finish instead of racing or being dropped. That reduces the chance of failed or duplicate tags/releases when release PRs are merged in quick succession.

^{Reviewed by Cursor Bugbot for commit 2cfc1b7. Bugbot is set up for automated code reviews on this repo. Configure here.}

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📥 Commits

Reviewing files that changed from the base of the PR and between cfd279b and 2cfc1b7.

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📒 Files selected for processing (1)

• .github/workflows/release-please.yml

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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