refactor: fix phpstan lvl5 error for AwsS3 adapter

phpstan-baseline.neon

@@ -1,25 +1,5 @@
 parameters:
 	ignoreErrors:
-		-
-			message: "#^Call to function is_resource\\(\\) with string will always evaluate to false\\.$#"
-			count: 2
-			path: src/Gaufrette/Adapter/AwsS3.php
-
-		-
-			message: "#^Method Gaufrette\\\\Adapter\\\\AwsS3\\:\\:write\\(\\) should return bool\\|int but returns string\\.$#"
-			count: 1
-			path: src/Gaufrette/Adapter/AwsS3.php
-
-		-
-			message: "#^Method Gaufrette\\\\Adapter\\\\AwsS3\\:\\:size\\(\\) should return int but returns false\\.$#"
-			count: 1
-			path: src/Gaufrette/Adapter/AwsS3.php
-
-		-
-			message: "#^Method Gaufrette\\\\Adapter\\\\AwsS3\\:\\:mimeType\\(\\) should return string but returns false\\.$#"
-			count: 1
-			path: src/Gaufrette/Adapter/AwsS3.php
-
 		-
 			message: "#^Parameter \\$options of method Gaufrette\\\\Adapter\\\\AzureBlobStorage\\:\\:deleteContainer\\(\\) has invalid typehint type MicrosoftAzure\\\\Storage\\\\Blob\\\\Models\\\\DeleteContainerOptions\\.$#"
 			count: 2

src/Gaufrette/Adapter/AwsS3.php

@@ -162,7 +162,7 @@ public function mtime(string $key): int|bool
     /**
      * {@inheritdoc}
      */
-    public function size(string $key): int
+    public function size(string $key): bool|int
     {
         try {
             $result = $this->service->headObject($this->getOptions($key));

src/Gaufrette/Adapter/SizeCalculator.php

@@ -10,7 +10,7 @@
 interface SizeCalculator
 {
     /**
-     * Returns the size of the specified key.
+     * @return false|int size of the specified key.
      */
-    public function size(string $key): int;
+    public function size(string $key): bool|int;
 }