Bump @11ty/eleventy from 0.11.1 to 0.12.1

Bumps [@11ty/eleventy](https://github.com/11ty/eleventy) from 0.11.1 to 0.12.1.
- [Release notes](https://github.com/11ty/eleventy/releases)
- [Changelog](https://github.com/11ty/eleventy/blob/master/docs/meta-release.md)
- [Commits](11ty/eleventy@v0.11.1...v0.12.1)

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