astro 2.8.1

#7611 904921cbe Thanks @bluwy! - Ignore content .json files prefixed with underscores (regression)
#7618 3669e2d27 Thanks @ematipico! - Add a fallback label if astro info command can't determine the package manager used.
#7620 831dfd151 Thanks @delucis! - Filter out astro from integration peer dependencies when running astro add