iproute2: update to 6.13

iproute2: update to 6.13

Update iproute2 to 6.13.

Release notes:
https://lwn.net/ml/all/20250120194053.3744d96b@hermes.local/

Allows us to drop multiple upstreamed patches:
package/network/utils/iproute2/patches/013-endian.h.patch
package/network/utils/iproute2/patches/014-basename.patch
package/network/utils/iproute2/patches/015-limits.h.patch
package/network/utils/iproute2/patches/016-limits.h.patch
package/network/utils/iproute2/patches/017-linux-limits.patch
package/network/utils/iproute2/patches/018-linux-limits.patch

Link: https://github.com/openwrt/openwrt/pull/18067
Signed-off-by: Robert Marko <robimarko@gmail.com>