package/go: bump version to 1.13.8

Includes fixes to the runtime, the crypto/x509, and net/http
packages.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 9b15ef3505f7db2ecc5c50cbca189796aca7899d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/go/go.hash

@@ -1,3 +1,3 @@
 # From https://golang.org/dl/
-sha256	e4ad42cc5f5c19521fbbbde3680995f2546110b5c6aa2b48c3754ff7af9b41f4  go1.13.7.src.tar.gz
+sha256	b13bf04633d4d8cf53226ebeaace8d4d2fd07ae6fa676d0844a688339debec34  go1.13.8.src.tar.gz
 sha256	2d36597f7117c38b006835ae7f537487207d8ec407aa9d9980794b2030cbc067  LICENSE

package/go/go.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GO_VERSION = 1.13.7
+GO_VERSION = 1.13.8
 GO_SITE = https://storage.googleapis.com/golang
 GO_SOURCE = go$(GO_VERSION).src.tar.gz