Install correct SO version

Author: creydr

openshift/e2e-common.sh

@@ -84,12 +84,12 @@ function install_serverless(){
   KNATIVE_EVENTING_MANIFESTS_DIR="${SCRIPT_DIR}/release/artifacts"
   export KNATIVE_EVENTING_MANIFESTS_DIR
 
-  GO111MODULE=off go get -u github.com/openshift-knative/hack/cmd/sobranch
+  GOFLAGS='' go install github.com/openshift-knative/hack/cmd/sobranch@latest
 
   local release
   release=$(yq r "${SCRIPT_DIR}/project.yaml" project.tag)
   release=${release/knative-/}
-  so_branch=$( $(go env GOPATH)/bin/sobranch --upstream-version "${release}")
+  so_branch=$( sobranch --upstream-version "${release}")
 
   local operator_dir=/tmp/serverless-operator
   git clone --branch "${so_branch}" https://github.com/openshift-knative/serverless-operator.git $operator_dir || git clone --branch main https://github.com/openshift-knative/serverless-operator.git $operator_dir