fix: type update_timeline param as mixed[] and drop stale phpstan baseline

The docblock now uses a typed array (mixed[]) so it satisfies both the
updated PHPCS (MissingParamType) and PHPStan (missingType.iterableValue).
Removed the now-obsolete phpstan-baseline.neon entry that ignored the old
"parameter $new_events with no type specified" error, which no longer
occurs and would otherwise be reported as an unmatched ignore.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: selul

includes/admin/models/class-rop-scheduler-model.php

@@ -535,8 +535,8 @@ private function get_week_start( $start = 0 ) {
 	/**
 	 * Update the events timeline.
 	 *
-	 * @param array  $new_events New events timeline.
-	 * @param string $account_id account id.
+	 * @param mixed[] $new_events New events timeline.
+	 * @param string  $account_id account id.
 	 *
 	 * @return bool Success or not.
 	 */

phpstan-baseline.neon

@@ -3078,12 +3078,6 @@ parameters:
 			count: 1
 			path: includes/admin/models/class-rop-scheduler-model.php
 
-		-
-			message: '#^Method Rop_Scheduler_Model\:\:update_timeline\(\) has parameter \$new_events with no type specified\.$#'
-			identifier: missingType.parameter
-			count: 1
-			path: includes/admin/models/class-rop-scheduler-model.php
-
 		-
 			message: '#^PHPDoc tag @SuppressWarnings has invalid value \(\(PHPMD\.UnusedLocalVariable\)\)\: Unexpected token "\.UnusedLocalVariable\)", expected ''\)'' at offset 89 on line 4$#'
 			identifier: phpDoc.parseError