hack/verify-toc.sh: Use go install instead of go get

Author: sanposhiho

hack/verify-toc.sh

@@ -38,7 +38,7 @@ trap exitHandler EXIT
 # perform go get in a temp dir as we are not tracking this version in a go module
 # if we do the go get in the repo, it will create / update a go.mod and go.sum
 cd "${TMP_DIR}"
-GO111MODULE=on GOBIN="${TMP_DIR}" go get "sigs.k8s.io/mdtoc@${TOOL_VERSION}"
+GO111MODULE=on GOBIN="${TMP_DIR}" go install "sigs.k8s.io/mdtoc@${TOOL_VERSION}"
 export PATH="${TMP_DIR}:${PATH}"
 cd "${ROOT}"