Replace macos11 with macos14 in github runners

Replace macos11 with macos14 in github runners

Github's documentation states:  macos-11 label has been deprecated and
will no longer be available after 6/28/2024. Add macos14 which is nowadays
supported instead.

The github macos-14 runner is using the M1 platform with ARM, so this
requires a bit more adjustment of paths.

Change-Id: Ia70f230b2e9a78939d1875395205c8f48c4944b7
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20240502122231.672-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/search?l=mid&q=20240502122231.672-1-gert@greenie.muc.de
Signed-off-by: Gert Doering <gert@greenie.muc.de>