Fix Portworx Helm repo URL and bump to v26.2

- Update repoURL to correct Portworx Helm chart location
- Bump version from 25.0.0 to 26.2.0 (latest per docs)

cluster/platform/portworx-csi/application.yaml

@@ -27,9 +27,9 @@ spec:
   project: default
   sources:
     # Source 1: Portworx Operator Helm chart from Portworx
-    - repoURL: https://raw.githubusercontent.com/portworx/px-operator/main/deploy/helm/charts
+    - repoURL: https://portworx.github.io/px-operator
       chart: px-operator
-      targetRevision: 25.0.0
+      targetRevision: 26.2.0
       helm:
         valueFiles:
           - $values/cluster/platform/portworx-csi/operator-values.yaml