mod: downgrade to Go 1.23 (#5313)

johanbrandhorst · web-flow · commit e80a2e5ec8a8 · 2025-03-04T09:40:45.000-08:00
This otherwise forces users to use 1.24.
diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/grpc-ecosystem/grpc-gateway/v2
 
-go 1.24
+go 1.23.0
 
 require (
 	github.com/antihax/optional v1.0.0
