fix: set lowcase_key and next fields on adding new http header#10

ruslanti merged 1 commit intomainG-Core/nginx-rust:mainfrom

CDP-1482_nginx-crash-on-adding-new-request-header-by-fastedgeG-Core/nginx-rust:CDP-1482_nginx-crash-on-adding-new-request-header-by-fastedgeCopy head branch name to clipboard