docs: update copyright year to 2026 for 3A Systems LLC

Agent-Logs-Url: https://github.com/OpenIdentityPlatform/OpenIDM/sessions/a70565dd-dbc0-4751-8cf9-13f2579bcdc5

Co-authored-by: vharseko <6818498+vharseko@users.noreply.github.com>

Author: Copilot

openidm-doc/src/main/asciidoc/integrators-guide/appendix-auth-modules.adoc

@@ -12,7 +12,7 @@
   information: "Portions copyright [year] [name of copyright owner]".
 
   Copyright 2017 ForgeRock AS.
-  Portions Copyright 2024-2025 3A Systems LLC.
+  Portions Copyright 2024-2026 3A Systems LLC.
 ////
 
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