fix: support new 11ty config files

[dwkns]

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Summary

Eleventy v2.0 supports new config filenames

See: https://github.com/netlify/framework-info/issues/829

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🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

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