fix: use wp_clear_scheduled_hook to properly clear all cron events

includes/class-peptide-news-deactivator.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * Fired during plugin deactivation.
+ *
+ * Clears scheduled cron events. Does NOT drop tables (data preservation).
+ *
+ * @since 1.0.0
+ */
+class Peptide_News_Deactivator {
+
+    public static function deactivate() {
+        wp_clear_scheduled_hook( 'peptide_news_cron_fetch' );
+    }
+}