[DEMO PR] Upgrade isort to 5.6.1

[AlexandreYang]

DEMO PR for #7748

[codecov]

Codecov Report

Merging #7749 into master will decrease coverage by 0.55%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
datadog_checks_base/tests/conftest.py	35.29% <0.00%> (-58.83%)	⬇️
datadog_checks_base/tests/test_wmicheck.py	84.61% <0.00%> (-15.39%)	⬇️
...atadog_checks_base/datadog_checks/base/__init__.py	73.33% <0.00%> (-13.34%)	⬇️
datadog_checks_base/tests/test_http.py	87.60% <0.00%> (-8.55%)	⬇️
datadog_checks_base/tests/test_winpdh.py	91.83% <0.00%> (-6.13%)	⬇️
datadog_checks_base/tests/test_wmisampler.py	93.93% <0.00%> (-6.07%)	⬇️
..._checks_base/datadog_checks/base/utils/platform.py	48.48% <0.00%> (-4.55%)	⬇️
datadog_checks_base/datadog_checks/base/ddyaml.py	56.71% <0.00%> (-4.48%)	⬇️
...atadog_checks/ibm_mq/collectors/stats_collector.py	88.70% <0.00%> (-3.23%)	⬇️
datadog_checks_base/tests/test_pdhbasecheck.py	97.50% <0.00%> (-2.50%)	⬇️
... and 280 more