Add missing return type

CURA-8587

plugins/Marketplace/LocalPackageList.py

@@ -74,7 +74,7 @@ class LocalPackageList(PackageList):
         self._connectManageButtonSignals(package)
         return package
 
-    def checkForUpdates(self, packages: List[Dict[str, Any]]):
+    def checkForUpdates(self, packages: List[Dict[str, Any]]) -> None:
         installed_packages = "installed_packages=".join([f"{package['package_id']}:{package['package_version']}&" for package in packages])
         request_url = f"{PACKAGE_UPDATES_URL}?installed_packages={installed_packages[:-1]}"