package/go: security bump to version 1.13.3

Fixes the following security issues (1.33.2):

- CVE-2019-17596: Invalid DSA public keys can cause a panic in dsa.Verify.
  In particular, using crypto/x509.Verify on a crafted X.509 certificate
  chain can lead to a panic, even if the certificates don’t chain to a
  trusted root.  The chain can be delivered via a crypto/tls connection to a
  client, or to a server that accepts and verifies client certificates.
  net/http clients can be made to crash by an HTTPS server, while net/http
  servers that accept client certificates will recover the panic and are
  unaffected.

Additionally, 1.13.3 fixes a number of issues. From the release notes:

Fixes to the go command, the toolchain, the runtime, syscall, net, net/http,
and crypto/ecdsa packages

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

package/go/go.hash

@@ -1,3 +1,3 @@
 # From https://golang.org/dl/
-sha256	81f154e69544b9fa92b1475ff5f11e64270260d46e7e36c34aafc8bc96209358  go1.13.1.src.tar.gz
+sha256	4f7123044375d5c404280737fbd2d0b17064b66182a65919ffe20ffe8620e3df  go1.13.3.src.tar.gz
 sha256	2d36597f7117c38b006835ae7f537487207d8ec407aa9d9980794b2030cbc067  LICENSE

package/go/go.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GO_VERSION = 1.13.1
+GO_VERSION = 1.13.3
 GO_SITE = https://storage.googleapis.com/golang
 GO_SOURCE = go$(GO_VERSION).src.tar.gz