package/iproute2: bump version to 5.15.0

For details see [1].

[1] https://lore.kernel.org/all/20211101164705.6f4f2e41@hermes.local

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/iproute2/iproute2.hash

@@ -1,3 +1,3 @@
 # From https://kernel.org/pub/linux/utils/net/iproute2/sha256sums.asc
-sha256  210fa785a52f3763c4287fd5ae63e246f6311bfaa48c424baab6d383bb7591d4  iproute2-5.14.0.tar.xz
+sha256  38e3e4a5f9a7f5575c015027a10df097c149111eeb739993128e5b2b35b291ff  iproute2-5.15.0.tar.xz
 sha256  e6d6a009505e345fe949e1310334fcb0747f28dae2856759de102ab66b722cb4  COPYING

package/iproute2/iproute2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-IPROUTE2_VERSION = 5.14.0
+IPROUTE2_VERSION = 5.15.0
 IPROUTE2_SOURCE = iproute2-$(IPROUTE2_VERSION).tar.xz
 IPROUTE2_SITE = $(BR2_KERNEL_MIRROR)/linux/utils/net/iproute2
 IPROUTE2_DEPENDENCIES = host-bison host-flex host-pkgconf \