package/strace: bump to version 5.11

package/strace: bump to version 5.11

Update COPYING: copyright year update, and added note about the bundled
Linux UAPI headers. Upstream commit 5bd8364f4202d ("Introduce bundled
directory") says:

   According to analysis made by Kent Gibson at [1], we are allowed to
   re-distribute unmodified Linux kernel UAPI headers under the same
   terms as they are provided by the Linux kernel, and such
   re-distribution does not affect the license of strace itself.

   [1] https://lore.kernel.org/linux-gpio/20210128032641.GA11655@sol/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>