[Misc] Update cpplint. (#4844)

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

tests/lint/lint.py

@@ -71,7 +71,7 @@ class LintHelper(object):
                                       '+build/include_what_you_use',
                                       '+build/include_order']))
         cpplint._SetCountingStyle('toplevel')
-        cpplint._line_length = 100
+        cpplint._line_length = 80
 
     def process_cpp(self, path, suffix):
         """Process a cpp file."""