Declare ext-exif as a required PHP extension

ImageUploadRequest::__construct() unconditionally calls Image::make(...)
->orientate() on every uploaded image (asset photos, user avatars,
company logos, etc.). Intervention\Image\Commands\ExifCommand throws
NotSupportedException when ext-exif is unavailable; ImageUploadRequest
catches NotReadableException but not NotSupportedException, so the
exception surfaces to the user as an unhandled 500 for any image
upload that carries an EXIF Orientation tag (i.e. virtually every
smartphone photo).

Add ext-exif to the require block so composer install fails fast
instead of letting the gap surface as a runtime 500.

---
Disclosure: drafted with a coding agent's help while investigating
which PHP extensions a containerized Snipe-IT deployment needs but
the package manifest doesn't declare.

Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

composer.json

@@ -19,6 +19,7 @@
   "require": {
     "php": "^8.2",
     "ext-curl": "*",
+    "ext-exif": "*",
     "ext-fileinfo": "*",
     "ext-iconv": "*",
     "ext-json": "*",