moving default lang/erlang from 25 -> 26

From: Dave Cottlehuber <dch_at_skunkwerks.at>
Date: Fri, 03 Jan 2025 16:01:53 UTC
hi BEAMers,it's that time of year again, updating default erlang to
OTP26 and cleaning up any detritus.

- https://reviews.freebsd.org/D48305 update default erlang to OTP26

There seems little point keeping these 2 in tree as they now expect
to be installed per-user in ~/.mix and ~/.hex now:

- https://reviews.freebsd.org/D48304 drop elixir-hex and elixir-make

If you prefer git, https://git.sr.ht/~dch/ports/tree/erlang

I'll go ahead and commit these in about a week assuming no issues.

A+
Dave