package/go: bump version to 1.13.13

go1.13.13 (released 2020/07/14) includes security fixes to the
crypto/x509 and net/http packages.

Signed-off-by: Christian Stewart <christian@paral.in>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit e31919878de33daaf0e5699e6aaf9e52abd19c8a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/go/go.hash

@@ -1,3 +1,3 @@
 # From https://golang.org/dl/
-sha256	17ba2c4de4d78793a21cc659d9907f4356cd9c8de8b7d0899cdedcef712eba34  go1.13.12.src.tar.gz
+sha256	ab7e44461e734ce1fd5f4f82c74c6d236e947194d868514d48a2b1ea73d25137  go1.13.13.src.tar.gz
 sha256	2d36597f7117c38b006835ae7f537487207d8ec407aa9d9980794b2030cbc067  LICENSE

package/go/go.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GO_VERSION = 1.13.12
+GO_VERSION = 1.13.13
 GO_SITE = https://storage.googleapis.com/golang
 GO_SOURCE = go$(GO_VERSION).src.tar.gz