package/wireless-regdb: bump version to 2021.04.21
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit e93cf29a702b9a778b851a158be7eff657f1e9a8)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>