[ci] Tweak size label threshold

[tmoerkerken]

Adjust thresholds based on recent feedback. The feeling was L was not really special enough, so we increased the range. Also, I reviewed a few ~25 line PR's and they felt easily doable in under ten minutes, so increased that range as well.

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request updates the size thresholds in the GitHub Actions workflow configuration file .github/workflows/size-label.yml. The "M" label threshold is adjusted from 20 to 25 lines of code, and the "L" label threshold is adjusted from 100 to 400 lines of code. A comment is added to the workflow to document the review-time philosophy intended for label sizing.

Possibly related PRs

• [ci] add workflow for labeling PR size #3432: Introduces the size-label workflow in .github/workflows/size-label.yml that is being reconfigured in this PR.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and clearly summarizes the main change: adjusting size label thresholds in the CI workflow configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description clearly explains the rationale for adjusting size label thresholds, relating directly to the changeset in the workflow configuration.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Pull request overview

Adjusts the PR size labeling thresholds in the GitHub Actions workflow to better match the intended review-time “feel” described in the PR.

Changes:

• Updated the size threshold boundaries for M and L labels.
• Added an inline comment documenting the intended philosophy behind the sizing.