Fix gen/csv target on macOS

Makefile

@@ -244,14 +244,14 @@ deploy/integreatly-rhmi-cr.yml:
 gen/csv:
 	@mv deploy/olm-catalog/integreatly-operator/integreatly-operator-$(PREVIOUS_TAG) deploy/olm-catalog/integreatly-operator/$(PREVIOUS_TAG)
 	@rm -rf deploy/olm-catalog/integreatly-operator/integreatly-operator-$(TAG)
-	@sed -i 's/image:.*/image: quay\.io\/integreatly\/integreatly-operator:v$(TAG)/g' deploy/operator.yaml
+	@sed -i '' 's/image:.*/image: quay\.io\/integreatly\/integreatly-operator:v$(TAG)/g' deploy/operator.yaml
 	operator-sdk generate csv --csv-version $(TAG) --default-channel --csv-channel=rhmi --update-crds --from-version $(PREVIOUS_TAG)
 	@echo Updating package file
-	@sed -i 's/$(PREVIOUS_TAG)/$(TAG)/g' version/version.go
-	@sed -i 's/$(PREVIOUS_TAG)/$(TAG)/g' deploy/olm-catalog/integreatly-operator/integreatly-operator.package.yaml
+	@sed -i '' 's/$(PREVIOUS_TAG)/$(TAG)/g' version/version.go
+	@sed -i '' 's/$(PREVIOUS_TAG)/$(TAG)/g' deploy/olm-catalog/integreatly-operator/integreatly-operator.package.yaml
 	@mv deploy/olm-catalog/integreatly-operator/$(PREVIOUS_TAG) deploy/olm-catalog/integreatly-operator/integreatly-operator-$(PREVIOUS_TAG)
 	@mv deploy/olm-catalog/integreatly-operator/$(TAG) deploy/olm-catalog/integreatly-operator/integreatly-operator-$(TAG)
-	@sed -i 's/integreatly-operator:v$(PREVIOUS_TAG)/integreatly-operator:v$(TAG)/g' deploy/olm-catalog/integreatly-operator/integreatly-operator-$(TAG)/integreatly-operator.v${TAG}.clusterserviceversion.yaml
+	@sed -i '' 's/integreatly-operator:v$(PREVIOUS_TAG)/integreatly-operator:v$(TAG)/g' deploy/olm-catalog/integreatly-operator/integreatly-operator-$(TAG)/integreatly-operator.v${TAG}.clusterserviceversion.yaml
 
 .PHONY: push/csv
 push/csv: