Remove `getSetCookie` workaround from `@keystatic/astro`#1453

Greenheart wants to merge 1 commit intoThinkmill:mainThinkmill/keystatic:mainfrom

Greenheart:fix/simplify-astro-integration-thanks-to-new-unidici-versionGreenheart/keystatic:fix/simplify-astro-integration-thanks-to-new-unidici-versionCopy head branch name to clipboard