chore: allow additional requests_kwargs parameter in sitemap loader (#20)

Author: a-klos

extractor-api-lib/src/extractor_api_lib/impl/extractors/sitemap_extractor.py

@@ -107,7 +107,7 @@ def _parse_sitemap_loader_parameters(self, extraction_parameters: ExtractionPara
         """
         sitemap_loader_parameters = {}
         for x in extraction_parameters.kwargs:
-            if x.key == "header_template":
+            if x.key == "header_template" or x.key == "requests_kwargs":
                 try:
                     sitemap_loader_parameters[x.key] = json.loads(x.value)
                 except (json.JSONDecodeError, TypeError):