upgrade go sdk version to 1.19

CC11001100 · CC11001100 · commit 236bfd21a2c5 · 2023-06-14T00:07:50.000+08:00
diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/golang-infrastructure/go-pointer
 
-go 1.18
+go 1.19
 
 require (
 	github.com/golang-infrastructure/go-reflect-utils v0.0.0-20221118150121-07bd8584ebab
