biome-ignore-unknown-bug

REPRODUCTION:

1. run npm install
2. run npx @biomejs/biome format . - see that /src/exclude/.eslintrc would be formatted, despite not being in the include list
3. remove "ignoreUnknown": true, from the biome.json
4. run npx @biomejs/biome format . again. - see that /src/exclude/.eslintrc is now excluded