go: bump to v1.11

Signed-off-by: Christian Stewart <christian@paral.in>
Reviewed-by: Anisse Astier <anisse@astier.eu>
Tested-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/go/go.hash

@@ -1,2 +1,2 @@
 # From https://golang.org/dl/
-sha256	6264609c6b9cd8ed8e02ca84605d727ce1898d74efa79841660b2e3e985a98bd	go1.10.2.src.tar.gz
+sha256	afc1e12f5fe49a471e3aae7d906c73e9d5b1fdd36d52d72652dde8f6250152fb	go1.11.src.tar.gz

package/go/go.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GO_VERSION = 1.10.2
+GO_VERSION = 1.11
 GO_SITE = https://storage.googleapis.com/golang
 GO_SOURCE = go$(GO_VERSION).src.tar.gz