astro 4.2.8

#9884 37369550ab57ca529fd6c796e5b0e96e897ca6e5 Thanks @lilnasy! - Fixes an issue where multiple cookies were sent in a single Set-Cookie header in the dev mode.
#9876 e9027f194b939ac5a4d795ee1a2c24e4a6fbefc0 Thanks @friedemannsommer! - Fixes an issue where using Response.redirect in an endpoint led to an error.
#9882 13c3b712c7ba45d0081f459fc06f142216a4ec59 Thanks @natemoo-re! - Improves handling of YAML parsing errors
#9878 a40a0ff5883c7915dd55881dcebd052b9f94a0eb Thanks @lilnasy! - Fixes an issue where setting trailingSlash to "never" had no effect on Astro.url.