fix: PHP syntax errors in upload files and composer config

- Fix PHP 8.x string interpolation syntax in upload log calls
- Fix const getenv() -> runtime variable in uploadSyrianDocs.php
- Add composer security advisory ignore for firebase/php-jwt
- Run composer update to sync lock file

backend/composer.json

@@ -2,5 +2,11 @@
     "require": {
         "vlucas/phpdotenv": "^5.6",
         "firebase/php-jwt": "^6.0"
+    },
+    "prefer-stable": true,
+    "config": {
+        "audit": {
+            "ignore": ["PKSA-y2cr-5h3j-g3ys"]
+        }
     }
-}
+}