wireless-regdb: update to 2020.11.20

wireless-regdb: update to 2020.11.20

This release contains various regulatory updates for different
countries, too many to list them here. While
https://wireless.wiki.kernel.org/en/developers/regulatory/wireless-regdb
mentiones http://drvbp1.linux-foundation.org/~mcgrof/rel-html/wireless-regdb/
as the location for release announcements, that server seems to be
defunct, so there is only https://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git
left for further details between the 2019.03.01 and 2020.11.20 version.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>