keycloak: update quay.io/keycloak/keycloak Docker tag to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
quay.io/keycloak/keycloak	Kustomization	major	25.0.6 -> 26.0.0

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[github-actions]

Infro diff for d7dd4f9

argocd.hashbang.sh > keycloak (0 files changed)

time="2024-10-04T07:13:09Z" level=warning msg="Failed to invoke grpc call. Use flag --grpc-web in grpc calls. To avoid this warning message, use flag --grpc-web."
time="2024-10-04T07:13:12Z" level=warning msg="Failed to invoke grpc call. Use flag --grpc-web in grpc calls. To avoid this warning message, use flag --grpc-web."

===== apps/Deployment keycloak/keycloak ======
--- /tmp/argocd-diff143718168/keycloak-live.yaml
+++ /tmp/argocd-diff143718168/keycloak
@@ -237,7 +237,7 @@
             name: keycloak-config-hdcdhkmdtd
         - secretRef:
             name: keycloak-config-9kffb44m7f
-        image: quay.io/keycloak/keycloak:25.0.6@sha256:82c5b7a110456dbd42b86ea572e728878549954cc8bd03cd65410d75328095d2
+        image: quay.io/keycloak/keycloak:26.0.0@sha256:6a1da18263c3717397ae9518244fc2821bbf85d0607bc09a79f074d04c29ff24
         imagePullPolicy: IfNotPresent
         livenessProbe:
           failureThreshold: 3