Discard explicit object inheritance.

In Python 3, `object` inheritance is explicit.
https://docs.python.org/3/tutorial/classes.html?highlight=inheritance#inheritance

Suggested by pyupgrade.

Author: DimitriPapadopoulos

blosc2/info.py

@@ -57,7 +57,7 @@ def info_html_report(items: list) -> str:
     return report
 
 
-class InfoReporter(object):
+class InfoReporter:
     def __init__(self, obj):
         self.obj = obj