distribution FreeBSD - changes :
- last release upgrade from ‘15.0’ to ‘15.1’
- last url from ‘https://download.freebsd.org/releases/ISO-IMAGES/15.0/FreeBSD-15.0-RELEASE-amd64-dvd1.iso’ to ‘https://download.freebsd.org/releases/ISO-IMAGES/15.1/FreeBSD-15.1-RELEASE-amd64-dvd1.iso’