refac/fix: do not process xlsx files with azure doc intelligence

backend/open_webui/retrieval/loaders/main.py

@@ -346,11 +346,9 @@ class Loader:
             self.engine == "document_intelligence"
             and self.kwargs.get("DOCUMENT_INTELLIGENCE_ENDPOINT") != ""
             and (
-                file_ext in ["pdf", "xls", "xlsx", "docx", "ppt", "pptx"]
+                file_ext in ["pdf", "docx", "ppt", "pptx"]
                 or file_content_type
                 in [
-                    "application/vnd.ms-excel",
-                    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                     "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
                     "application/vnd.ms-powerpoint",
                     "application/vnd.openxmlformats-officedocument.presentationml.presentation",