chore(camel-test-infra-keycloak): upgrade keycloak.container to 26.4.7 (#20546)

Update keycloak.container from 26.3.5 to 26.4.7

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Author: github-actions[bot]

test-infra/camel-test-infra-keycloak/src/main/resources/org/apache/camel/test/infra/keycloak/services/container.properties

@@ -15,5 +15,5 @@
 ## limitations under the License.
 ## ---------------------------------------------------------------------------
 ## Keycloak container configuration for test-infra
-keycloak.container=mirror.gcr.io/keycloak/keycloak:26.3.5
+keycloak.container=mirror.gcr.io/keycloak/keycloak:26.4.7
 keycloak.container.version.exclude=nightly