chore(release): add 1.4.0 release changes (kubeflow#1063)

Makefile

@@ -16,7 +16,7 @@
 #  - The help target was derived from https://stackoverflow.com/a/35730328/5601796
 
 VENV ?= .venv
-KFP_TEKTON_RELEASE ?= v1.3.1
+KFP_TEKTON_RELEASE ?= v1.4.0
 export VIRTUAL_ENV := $(abspath ${VENV})
 export PATH := ${VIRTUAL_ENV}/bin:${PATH}
 DOCKER_REGISTRY ?= aipipeline

VERSION

@@ -1 +1 @@
-1.3.1
+1.4.0

guides/kfp_tekton_install.md

@@ -14,7 +14,7 @@
 
 ## Installation Targets and Prerequisites
 
-A Kubernetes cluster `v1.21` that has least 8 vCPU and 16 GB memory.
+A Kubernetes cluster `v1.22` that has least 8 vCPU and 16 GB memory.
 
 ### IBM Cloud Kubernetes Service (IKS)
 
@@ -55,15 +55,15 @@ To install the standalone Kubeflow Pipelines with Tekton, run the following step
          -p '{"data":{"default-timeout-minutes": "0"}}'
    ```
 
-3. Install Kubeflow Pipelines with Tekton backend (`kfp-tekton`) `v1.3.1` [custom resource definitions](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/)(CRDs).
+3. Install Kubeflow Pipelines with Tekton backend (`kfp-tekton`) `v1.4.0` [custom resource definitions](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/)(CRDs).
    > Note: You can ignore the error `no matches for kind "Application" in version "app.k8s.io/v1beta1"` since it's a warning saying `application` CRD is not yet ready.
     ```shell
-    kubectl apply --selector kubeflow/crd-install=true -f install/v1.3.1/kfp-tekton.yaml
+    kubectl apply --selector kubeflow/crd-install=true -f install/v1.4.0/kfp-tekton.yaml
     ```
 
-4. Install Kubeflow Pipelines with Tekton backend (`kfp-tekton`) `v1.3.1` deployment
+4. Install Kubeflow Pipelines with Tekton backend (`kfp-tekton`) `v1.4.0` deployment
     ```shell
-    kubectl apply -f install/v1.3.1/kfp-tekton.yaml
+    kubectl apply -f install/v1.4.0/kfp-tekton.yaml
     ```
 
 5. Then, if you want to expose the Kubeflow Pipelines endpoint outside the cluster, run the following commands: