chore: update type of prov_payload in py doc string of the Analyze.run method

Author: tromai

src/macaron/slsa_analyzer/analyzer.py

@@ -131,7 +131,7 @@ def run(
             The path to the SBOM.
         skip_deps : bool
             Flag to skip dependency resolution.
-        prov_payload : InToToPayload
+        prov_payload : InToToPayload | None
             The provenance intoto payload for the main software component.
 
         Returns