feat!: Upgrade Flux to v2.0.0-rc.1 and update apiVersions (#693)

kubernetes/flux/apps.yaml

@@ -1,5 +1,5 @@
 ---
-apiVersion: kustomize.toolkit.fluxcd.io/v1beta2
+apiVersion: kustomize.toolkit.fluxcd.io/v1
 kind: Kustomization
 metadata:
   name: cluster-apps
@@ -23,7 +23,7 @@ spec:
         name: cluster-secrets
   patches:
     - patch: |-
-        apiVersion: kustomize.toolkit.fluxcd.io/v1beta2
+        apiVersion: kustomize.toolkit.fluxcd.io/v1
         kind: Kustomization
         metadata:
           name: not-used
@@ -40,6 +40,5 @@ spec:
                 name: cluster-secrets
       target:
         group: kustomize.toolkit.fluxcd.io
-        version: v1beta2
         kind: Kustomization
         labelSelector: substitution.flux.home.arpa/disabled notin (true)