New Eglot release

[João Távora]

Hello,

After some significant work done to Eglot in emacs-29 the last few
weeks, I'd like to make the 1.12 release so people can use it from GNU
ELPA in older Emacs versions.

However, one question remains from the merge: where to put
Eglot-specific NEWS describing the latest user-visible changes??

I'm not opposed to putting them in Emacs's own NEWS file, except that
for this Emacs 29 version it'd be a bit akward, since Eglot just made it
in, so the existing NEWS is about Eglot's appearance, not about what
changed recently.

I think, someone suggested /etc/EGLOT-NEWS at the time.  That could
work, I guess.  But would anyone read it?

Also, it'd be nice that it'd go somewhere where the description of the
package in https://elpa.gnu.org/ can pick it up.

João