Bump Go to 1.18.2 (#1462)

As a part of #1298, I'm going to use Go fuzzing which is availabls since Go 1.18.

Co-authored-by: Callum Tait <[email protected]>

Makefile

@@ -221,7 +221,7 @@ ifeq (, $(wildcard $(GOBIN)/controller-gen))
 	CONTROLLER_GEN_TMP_DIR=$$(mktemp -d) ;\
 	cd $$CONTROLLER_GEN_TMP_DIR ;\
 	go mod init tmp ;\
-	go get sigs.k8s.io/controller-tools/cmd/[email protected] ;\
+	go install sigs.k8s.io/controller-tools/cmd/[email protected] ;\
 	rm -rf $$CONTROLLER_GEN_TMP_DIR ;\
 	}
 endif
@@ -241,7 +241,7 @@ ifeq (, $(wildcard $(GOBIN)/yq))
 	YQ_TMP_DIR=$$(mktemp -d) ;\
 	cd $$YQ_TMP_DIR ;\
 	go mod init tmp ;\
-	go get github.com/mikefarah/yq/[email protected] ;\
+	go install github.com/mikefarah/yq/[email protected] ;\
 	rm -rf $$YQ_TMP_DIR ;\
 	}
 endif