package/xmrig: bump version to 6.21.1
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit d566d6a3692df6859a2b62c994bddd0ec8768a24)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>