meta: remove AUTHORS file

The AUTHORS file does not serve any significant practical purpose and is
a bit of a maintenance annoyance. Let's remove it.

PR-URL: #46845
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Jiawen Geng <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Beth Griggs <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Nitzan Uziely <[email protected]>
Reviewed-By: Rafael Gonzaga <[email protected]>
Reviewed-By: Tierney Cyren <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>