[6.x] Fix validating image/jpeg images after Symfony/Mime update (#35419

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* [6.x]  Fix validating image/jpeg images after Symfony/Mime update

Symfony/Mime v5.20 changed the returned extension for an image with image/jpeg mime type: symfony/mime@aa1d922. This commit adds `.jpg`, which fixes the validation.

* [6.x] Add test for image validation with jpg extension

src/Illuminate/Validation/Concerns/ValidatesAttributes.php

@@ -1054,7 +1054,7 @@ public function validateLte($attribute, $value, $parameters)
      */
     public function validateImage($attribute, $value)
     {
-        return $this->validateMimes($attribute, $value, ['jpeg', 'png', 'gif', 'bmp', 'svg', 'webp']);
+        return $this->validateMimes($attribute, $value, ['jpg', 'jpeg', 'png', 'gif', 'bmp', 'svg', 'webp']);
     }
 
     /**

tests/Validation/ValidationValidatorTest.php

@@ -2703,6 +2703,12 @@ public function testValidateImage()
         $file7->expects($this->any())->method('getClientOriginalExtension')->willReturn('webp');
         $v = new Validator($trans, ['x' => $file7], ['x' => 'Image']);
         $this->assertTrue($v->passes());
+
+        $file2 = $this->getMockBuilder(UploadedFile::class)->setMethods(['guessExtension', 'getClientOriginalExtension'])->setConstructorArgs($uploadedFile)->getMock();
+        $file2->expects($this->any())->method('guessExtension')->willReturn('jpg');
+        $file2->expects($this->any())->method('getClientOriginalExtension')->willReturn('jpg');
+        $v = new Validator($trans, ['x' => $file2], ['x' => 'Image']);
+        $this->assertTrue($v->passes());
     }
 
     public function testValidateImageDoesNotAllowPhpExtensionsOnImageMime()