package/go: security bump to version 1.21.9

go1.21.9 (released 2024-04-03) includes a security fix to the net/http
package, as well as bug fixes to the linker, and the go/types and net/http
packages.

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

package/go/go.hash

@@ -1,3 +1,3 @@
 # From https://go.dev/dl
-sha256  dc806cf75a87e1414b5b4c3dcb9dd3e9cc98f4cfccec42b7af617d5a658a3c43  go1.21.8.src.tar.gz
+sha256  58f0c5ced45a0012bce2ff7a9df03e128abcc8818ebabe5027bb92bafe20e421  go1.21.9.src.tar.gz
 sha256  2d36597f7117c38b006835ae7f537487207d8ec407aa9d9980794b2030cbc067  LICENSE

package/go/go.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GO_VERSION = 1.21.8
+GO_VERSION = 1.21.9
 GO_SITE = https://storage.googleapis.com/golang
 GO_SOURCE = go$(GO_VERSION).src.tar.gz