fix: failing markdown link test in ci

[deependujha]

What does this PR do?

Fixes #<issue_number>

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https://github.com/Lightning-AI/pytorch-lightning/actions/runs/16269226659/job/45949122870

Markdown link test fails in CI, due to too many requests (429). Hence, updating the .github/markdown-links-config.json to retry on 429 with some delay.

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📚 Documentation preview 📚: https://pytorch-lightning--20979.org.readthedocs.build/en/20979/

[github-actions]

⚡ Required checks status: All passing 🟢

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