gnu: xkeyboard-config: Upgrade to 2.41.

[B. Wilson]

Note that the canonical location for sources has changed from
ftp.freedesktop.org to x.org. See the below discussion on the xkeyboard-config
issue tracker:

https://gitlab.freedesktop.org/xkeyboard-config/xkeyboard-config/-/issues/353#note_2431606

The old location still works, but it remains several versions behind upstream.

On my machine, the referrers of xkeyboard-config are:

    libxkbcommon
    setxkbmap
    xkbcomp
    xorg-server

What's the proper procedure when updating packages to check that its reverse
dependencies aren't broken by the change?

txtX4sAE1yCVX.txt
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