ci: bump pinned Flutter SDK to version 3.41.9 (#8964)

An automated check has detected a new stable release of the Flutter SDK.

* **New Pinned Version**: `3.41.9`

This Pull Request updates our shared provisioning script (`tool/provision_flutter.sh`) to target this version. All presubmit tests will be run against this version to verify compatibility.

Author: flutteractionsbot

tool/provision_flutter.sh

@@ -11,7 +11,7 @@ if [ ! -d "../flutter" ]; then
   OS_NAME=$(uname -s | tr '[:upper:]' '[:lower:]')
   # Pinned Flutter SDK version. This constant is automatically checked and updated weekly
   # by the .github/workflows/update_flutter.yaml GitHub Actions workflow.
-  FLUTTER_VERSION="3.41.0"
+  FLUTTER_VERSION="3.41.9"
 
   echo "Provisioning Flutter SDK version ${FLUTTER_VERSION} for ${OS_NAME}..."
   if [ "$OS_NAME" = "darwin" ]; then