tls: validate ticket keys buffer

Fixes: https://github.com/nodejs/node/issues/38305

PR-URL: https://github.com/nodejs/node/pull/38308


Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>