chore: improved EachKey error message

Author: andrepimpao

src/ChainedValidatorInterface.php

@@ -25,7 +25,7 @@ public function country(
 
     public function eachKey(
         Validator $validator,
-        string $message = '{{ message }}'
+        string $message = 'Invalid key: {{ message }}'
     ): ChainedValidatorInterface&Validator;
 
     public function eachValue(

src/Rule/EachKey.php

@@ -11,7 +11,7 @@ class EachKey extends AbstractRule implements RuleInterface
 {
     public function __construct(
         private readonly Validator $validator,
-        private readonly string $message = '{{ message }}'
+        private readonly string $message = 'Invalid key: {{ message }}'
     ) {}
 
     public function assert(mixed $value, string $name): void

src/StaticValidatorInterface.php

@@ -24,7 +24,7 @@ public static function country(
 
     public static function eachKey(
         Validator $validator,
-        string $message = '{{ message }}'
+        string $message = 'Invalid key: {{ message }}'
     ): ChainedValidatorInterface&Validator;
 
     public static function eachValue(