UHF-X: Add $context property to flysystem stream wrapper

PHP requires that stream wrapper implementations have public $context
property. This property is missing from drupal/flysystem stream
wrappers. Since PHP 8.2, assigning dynamic properties is deprecated.

See:
 - https://www.php.net/manual/en/class.streamwrapper.php#streamwrapper.props.context
 - https://www.drupal.org/project/flysystem/issues/3387094
 - twistor/flysystem-stream-wrapper#27

composer.json

@@ -11,5 +11,12 @@
     "require-dev": {
         "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
         "drupal/coder": "^8.3"
+    },
+    "extra": {
+        "patches": {
+            "twistor/flysystem-stream-wrapper": {
+                "PHP 8.2 support (https://www.drupal.org/project/flysystem/issues/3387094)": "https://raw.githubusercontent.com/City-of-Helsinki/drupal-module-helfi-azure-fs/ddb222622b92d1c2b7db975a84167a00579a1ad0/patches/3387094-add-context-property-to-stream-wrapper.patch"
+            }
+        }
     }
 }