Merge pull request #584 from zshihang/master

update go version to 1.20.6

Author: k8s-ci-robot

WORKSPACE

@@ -47,7 +47,7 @@ go_rules_dependencies()
 
 go_download_sdk(
     name = "go_sdk",
-    version = "1.20.5",
+    version = "1.20.6",
 )
 
 go_register_toolchains()