Update dependency markdown-it-anchor to v8.0.5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
markdown-it-anchor	8.0.4 -> 8.0.5

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Release Notes

valeriangalliat/markdown-it-anchor

### [`v8.0.5`](https://togithub.com/valeriangalliat/markdown-it-anchor/blob/master/CHANGELOG.md#​805---2021-07-01) [Compare Source](https://togithub.com/valeriangalliat/markdown-it-anchor/compare/v8.0.4...v8.0.5) - Revert `html_inline` to `html_block` in legacy permalink. (\[[#​98](https://togithub.com/valeriangalliat/markdown-it-anchor/issues/98)])

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