Framework makes it their point but also charges for it. Some big make laptops also allow to upgrade parts.

But lets not forget Linux specific laptops. They generally allow upgrading ram and storage. Slimbook even sold me a newer (but also new) keyboard when mine gave up after 5 years or so. Most parts seem to be available still.

Some brands to look for in this group are Tuxedo, bto, slimbook, starbook. Clevo might work too.