fix(release-v3.0): fix makefile go version update image (#1218)

scripts/make-rules/golang.mk

@@ -17,7 +17,7 @@
 #
 
 GO := go
-GO_SUPPORTED_VERSIONS ?= 1.18|1.19|1.20
+GO_SUPPORTED_VERSIONS ?= 1.18|1.19|1.20|1.21
 
 GO_LDFLAGS += -X $(VERSION_PACKAGE).gitVersion=$(GIT_TAG) \
 	-X $(VERSION_PACKAGE).gitCommit=$(GIT_COMMIT) \
@@ -192,4 +192,4 @@ go.clean:
 ## copyright.help: Show copyright help
 .PHONY: go.help
 go.help: scripts/make-rules/golang.mk
-	$(call smallhelp)
+	$(call smallhelp)