Update dependency minimal-mistakes-jekyll to v4.28.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
minimal-mistakes-jekyll	4.28.0 → 4.28.1

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Release Notes

mmistakes/minimal-mistakes (minimal-mistakes-jekyll)

v4.28.1

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Enhancements

• Respect custom parameters in yiq-contrast-color function (#​5453)
• Allow specifying rtl in both page and layout (#​5460)
• Add title attribute to video iframes for accessibility (#​5471)
• Silence "Sass @​import rules are deprecated" warning
• Allow per-post or per-collection date_format values. (#​5477)
• Replace inline style padding-left with padding-inline-start for RTL support (#​5480)

Bug Fixes

• Fix animations to pass Lighthouse. (#​5494)

Documentation & Maintenance

• Update /docs/javascript/ to reflect changes in 0b8b523
• Update bad-pr.yml script from ubuntu-slim to ubuntu-latest (#​5483)
• Use relative paths for README images (#​5488)

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