Update devDependencies

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@11ty/eleventy-fetch	4.0.0 -> 4.0.1
cssnano	6.0.5 -> 6.1.0
open-props	1.6.20 -> 1.6.21

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Release Notes

11ty/eleventy-fetch (@​11ty/eleventy-fetch)

### [`v4.0.1`](https://togithub.com/11ty/eleventy-fetch/compare/v4.0.0...v4.0.1) [Compare Source](https://togithub.com/11ty/eleventy-fetch/compare/v4.0.0...v4.0.1)

cssnano/cssnano (cssnano)

### [`v6.1.0`](https://togithub.com/cssnano/cssnano/releases/tag/cssnano%406.1.0): v6.1.0 [Compare Source](https://togithub.com/cssnano/cssnano/compare/cssnano@6.0.5...cssnano@6.1.0) This release contains a lot of fixes to Browserslist support thanks to [@​colinrotherham](https://togithub.com/colinrotherham) #### Features - support Browserslist options in more plugins - support overriding autoprefixer options Additionally, this release includes improved TypeScript types.

argyleink/open-props (open-props)

### [`v1.6.21`](https://togithub.com/argyleink/open-props/compare/40d08ded4b3a05e13b8fc1764fd563544462994b...63143f01530813c84f3002fb2df8b5bdb96e13ca) [Compare Source](https://togithub.com/argyleink/open-props/compare/40d08ded4b3a05e13b8fc1764fd563544462994b...63143f01530813c84f3002fb2df8b5bdb96e13ca)

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