refactor: use exec_module instead of load_module

Author: igboyes

virtool_workflow/runtime/discover.py

@@ -88,7 +88,11 @@ def import_module_from_file(module_name: str, path: Path) -> ModuleType:
     spec = spec_from_file_location(module_name, path)
     if spec is None:
         raise ImportError(f"could not import {path}")
-    module = spec.loader.load_module(module_from_spec(spec).__name__)
+
+    module = module_from_spec(spec)
+    if spec.loader is None:
+        raise ImportError(f"could not load {path}")
+    spec.loader.exec_module(module)
 
     sys.path.remove(module_parent)