fix: replace deprecated builtin repo in pre-commit config

[Abdelsalam-Abbas]

Summary

• Replace repo: builtin with repo: https://github.com/pre-commit/pre-commit-hooks (rev v5.0.0) in .pre-commit-config.yaml
• The builtin syntax was removed in pre-commit 4.0, causing InvalidConfigError for anyone on pre-commit 4.x
• No behavior change -- same hooks (check-added-large-files, check-merge-conflict, check-yaml, end-of-file-fixer, trailing-whitespace)

Test plan

• pre-commit run --all-files passes with pre-commit 4.5.1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ef9d4c1f-40ab-4988-9067-86b0439f0fbf

📥 Commits

Reviewing files that changed from the base of the PR and between f57044e and ae57cd5.

📒 Files selected for processing (1)

• .pre-commit-config.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-precommit-config

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[Abdelsalam-Abbas]

Closing -- the team uses prek (not pre-commit), which supports repo: builtin fine. The issue was only on my side from running pre-commit install instead of prek install.