package/go: security bump to version 1.11.6

Fixes the following security vulnerability:

CVE-2019-9741: An issue was discovered in net/http in Go 1.11.5.  CRLF
injection is possible if the attacker controls a url parameter, as
demonstrated by the second argument to http.NewRequest with \r\n followed by
an HTTP header or a Redis command.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/go/go.hash

@@ -1,3 +1,3 @@
 # From https://golang.org/dl/
-sha256	bc1ef02bb1668835db1390a2e478dcbccb5dd16911691af9d75184bbe5aa943e  go1.11.5.src.tar.gz
+sha256	a96da1425dcbec094736033a8a416316547f8100ab4b72c31d4824d761d3e133  go1.11.6.src.tar.gz
 sha256	2d36597f7117c38b006835ae7f537487207d8ec407aa9d9980794b2030cbc067  LICENSE

package/go/go.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GO_VERSION = 1.11.5
+GO_VERSION = 1.11.6
 GO_SITE = https://storage.googleapis.com/golang
 GO_SOURCE = go$(GO_VERSION).src.tar.gz