Update SPDX copyright years in migration guide

Author: mgarciaLKS

migration-guides/GENERIC_BITNAMI_TO_CLOUDPIRATES_KEYCLOAK_MIGRATION_GUIDE.md

@@ -508,9 +508,9 @@ keycloak:
 This work is licensed under the [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/legalcode).
 
 - SPDX-License-Identifier: CC-BY-4.0
-- SPDX-FileCopyrightText: 2025, 2026 Contributors to the Eclipse Foundation
-- SPDX-FileCopyrightText: 2025, 2026 Catena-X Automotive Network e.V.
-- SPDX-FileCopyrightText: 2025, 2026 LKS Next
+- SPDX-FileCopyrightText: 2026 Contributors to the Eclipse Foundation
+- SPDX-FileCopyrightText: 2026 Catena-X Automotive Network e.V.
+- SPDX-FileCopyrightText: 2026 LKS Next
 
 - SPDX-License-Identifier: CC-BY-4.0
 - SPDX-FileCopyrightText: 2026 Contributors to the Eclipse Foundation