sed: update 4.8 -> 4.9

License-Update:
-URL of license changed from
 https://www.gnu.org/philosophy/why-not-lgpl.html
 to https://www.gnu.org/licenses/why-not-lgpl.htm


-Copyright year updated to 2022

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>