Remove deprecated reduceMany method (#40565)

Author: JosephSilber

src/Illuminate/Collections/Traits/EnumeratesValues.php

@@ -758,22 +758,6 @@ public function reduce(callable $callback, $initial = null)
         return $result;
     }
 
-    /**
-     * Reduce the collection to multiple aggregate values.
-     *
-     * @param  callable  $callback
-     * @param  mixed  ...$initial
-     * @return array
-     *
-     * @deprecated Use "reduceSpread" instead
-     *
-     * @throws \UnexpectedValueException
-     */
-    public function reduceMany(callable $callback, ...$initial)
-    {
-        return $this->reduceSpread($callback, ...$initial);
-    }
-
     /**
      * Reduce the collection to multiple aggregate values.
      *