chore(deps-dev): bump lighthousebot from `7f87bca` to `a4bfc08`

[dependabot-preview[bot]]

Bumps lighthousebot from 7f87bca to a4bfc08.

Commits

- [`a4bfc08`](https://github.com/GoogleChromeLabs/lighthousebot/commit/a4bfc0857741c1cd6bde9ded967971fd27254ed6) Update docs to note Lighthouse CI - See full diff in [compare view](https://github.com/GoogleChromeLabs/lighthousebot/compare/7f87bcaeb221009354d90ab706379ed21eed0d39...a4bfc0857741c1cd6bde9ded967971fd27254ed6)

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[lighthousebot]

Updated Lighthouse report for the changes in this PR:

Category	New score	Required threshold
Performance	87	80
Accessibility	100	80
Best Practices	93	80
SEO	90	80
Progressive Web App	73	80

Tested with Lighthouse version: 4.1.0

[lighthousebot]

Updated Lighthouse report for the changes in this PR:

Category	New score	Required threshold
Performance	93	80
Accessibility	100	80
Best Practices	93	80
SEO	90	80
Progressive Web App	73	80

Tested with Lighthouse version: 4.1.0

[lighthousebot]

Updated Lighthouse report for the changes in this PR:

Category	New score	Required threshold
Performance	87	80
Accessibility	100	80
Best Practices	93	80
SEO	90	80
Progressive Web App	73	80

Tested with Lighthouse version: 4.1.0