fix: update migration version (#2343)

## Summary
This migration was added in #2300, however we couldn't merge in time.
Now updating the migration version (hence filename) to prevent any
possible issues.

Author: cemalkilic

…00_add_token_endpoint_auth_method.up.sql …00_add_token_endpoint_auth_method.up.sqlmigrations/20251216000000_add_token_endpoint_auth_method.up.sql renamed to migrations/20260121000000_add_token_endpoint_auth_method.up.sql migrations/20251216000000_add_token_endpoint_auth_method.up.sql renamed to migrations/20260121000000_add_token_endpoint_auth_method.up.sql

@@ -1,12 +1,12 @@
 -- Add token_endpoint_auth_method column to oauth_clients table
 -- Per RFC 7591: "If unspecified or omitted, the default is 'client_secret_basic'"
 -- For public clients, the default is 'none' since they don't have a client secret
-/* auth_migration: 20251216000000 */
+/* auth_migration: 20260121000000 */
 alter table {{ index .Options "Namespace" }}.oauth_clients
     add column if not exists token_endpoint_auth_method text check (token_endpoint_auth_method in ('client_secret_basic', 'client_secret_post', 'none'));
 
 -- Set default values for existing clients based on their client_type
-/* auth_migration: 20251216000000 */
+/* auth_migration: 20260121000000 */
 update {{ index .Options "Namespace" }}.oauth_clients
     set token_endpoint_auth_method = case
         when client_type = 'public' then 'none'
@@ -15,6 +15,6 @@ update {{ index .Options "Namespace" }}.oauth_clients
     where token_endpoint_auth_method is null;
 
 -- Now make the column not null
-/* auth_migration: 20251216000000 */
+/* auth_migration: 20260121000000 */
 alter table {{ index .Options "Namespace" }}.oauth_clients
     alter column token_endpoint_auth_method set not null;