Update ghcr.io/owl-corp/keycloak Docker tag to v26.2.1

| datasource | package                   | from   | to     |
| ---------- | ------------------------- | ------ | ------ |
| docker     | ghcr.io/owl-corp/keycloak | 26.1.1 | 26.2.1 |

Author: renovate[bot]

kubernetes/namespaces/tooling/keycloak/deployment.yaml

@@ -18,7 +18,7 @@ spec:
       serviceAccountName: internal-tls-issuer
       containers:
         - name: keycloak
-          image: ghcr.io/owl-corp/keycloak:26.1.1
+          image: ghcr.io/owl-corp/keycloak:26.2.1
           imagePullPolicy: Always
           envFrom:
             - secretRef: