fix: updated the capx version used (#513)

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**What problem does this PR solve?**:
updated the capx version used from sha to released tag of v1.4.0-alpha.2

**Which issue(s) this PR fixes**:
Fixes # https://d2iq.atlassian.net/browse/D2IQ-100463

**How Has This Been Tested?**:
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<pre>
make examples.sync
</pre>

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hack/examples/bases/nutanix/cluster/kustomization.yaml.tmpl

@@ -7,7 +7,7 @@ kind: Kustomization
 resources:
 - ../../../additional-resources/dockerhub-secret.yaml
 - ../../../additional-resources/nutanix/csi-secret.yaml
-- https://raw.githubusercontent.com/nutanix-cloud-native/cluster-api-provider-nutanix/1a7cd69ba35de01e56dcf2dda7f31973111d2317/templates/cluster-template-topology.yaml
+- https://github.com/nutanix-cloud-native/cluster-api-provider-nutanix/releases/download/${CAPX_VERSION}/cluster-template-topology.yaml
 
 sortOptions:
   order: fifo

hack/examples/bases/nutanix/clusterclass/kustomization.yaml.tmpl

@@ -5,7 +5,7 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
 resources:
-- https://raw.githubusercontent.com/nutanix-cloud-native/cluster-api-provider-nutanix/1a7cd69ba35de01e56dcf2dda7f31973111d2317/templates/cluster-template-clusterclass.yaml
+- https://github.com/nutanix-cloud-native/cluster-api-provider-nutanix/releases/download/${CAPX_VERSION}/cluster-template-clusterclass.yaml
 
 configurations:
   - kustomizeconfig.yaml