Update Dependency with chardet>=3.0.2,<6

https://github.com/chardet/chardet/releases/tag/5.0.0 was released on
2022-06-25 with remove of Python 3.6 support, which also align with our
Python > 3.6 requirement.

Signed-off-by: Wong Hoi Sing Edison <hswong3i@pantarei-design.com>

setup.py

@@ -123,7 +123,7 @@ def run_tests(self):
     extras_require={
         "security": [],
         "socks": ["PySocks>=1.5.6, !=1.5.7"],
-        "use_chardet_on_py3": ["chardet>=3.0.2,<5"],
+        "use_chardet_on_py3": ["chardet>=3.0.2,<6"],
     },
     project_urls={
         "Documentation": "https://requests.readthedocs.io",