update verify target to vendor before verifying to ensure tools are present

Signed-off-by: Per Goncalves da Silva <pegoncal@redhat.com>

Author: Per Goncalves da Silva

Makefile

@@ -206,7 +206,7 @@ verify-mockgen: mockgen
 verify-manifests: manifests
 	$(MAKE) diff
 
-verify: verify-codegen verify-mockgen verify-manifests
+verify: vendor verify-codegen verify-mockgen verify-manifests
 
 # before running release, bump the version in OLM_VERSION and push to master,
 # then tag those builds in quay with the version in OLM_VERSION