I'm forwarding this patch to the bug tracker, that AFAICT was never
installed or followed up on.  The first patch saw some discussion here:

https://lists.gnu.org/archive/html/emacs-devel/2020-12/msg00993.html

-------------------- Start of forwarded message --------------------
From: Pedro Andres Aranda Gutierrez <paaguti@gmail.com>
Date: Fri, 18 Dec 2020 08:58:34 +0100
Subject: PATCH: update themes to support mode-line (no bold in
 line-number-current-line)
To: emacs-devel@gnu.org