[10.x] setValue() in Validator (#46716)

* Set value in validator

* Update docblock

* extra space in docs

* Fix docblock again

* Update Validator.php

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: joelharkes

src/Illuminate/Validation/Validator.php

@@ -1086,6 +1086,18 @@ protected function getValue($attribute)
         return Arr::get($this->data, $attribute);
     }
 
+    /**
+     * Set the value of a given attribute.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return void
+     */
+    public function setValue($attribute, $value)
+    {
+        Arr::set($this->data, $attribute, $value);
+    }
+
     /**
      * Get the validation rules.
      *