fix minio helth bug (#850)

### What problem does this PR solve?

#643 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

deepdoc/parser/excel_parser.py

 
 
 class RAGFlowExcelParser:
-    def html(self, fnm,chunk_rows=256):
+    def html(self, fnm, chunk_rows=256):
         if isinstance(fnm, str):
             wb = load_workbook(fnm)
         else:

rag/app/one.py

     elif re.search(r"\.xlsx?$", filename, re.IGNORECASE):
         callback(0.1, "Start to parse.")
         excel_parser = ExcelParser()
-        sections = excel_parser.html(binary , 10000000)
+        sections = excel_parser.html(binary, 1000000000)
 
     elif re.search(r"\.txt$", filename, re.IGNORECASE):
         callback(0.1, "Start to parse.")

rag/utils/minio_conn.py

         self.conn = None
 
     def health(self):
-        bucket, fnm, binary = "_t@@@1", "_t@@@1", b"_t@@@1"
+        bucket, fnm, binary = "txtxtxtxt1", "txtxtxtxt1", b"_t@@@1"
         if not self.conn.bucket_exists(bucket):
             self.conn.make_bucket(bucket)
         r = self.conn.put_object(bucket, fnm,