Fixed issue for Python 3.9 not supporting `isinstance` on typing obje… #4892

Job	Run time
build_sdist_ubuntu_hipo (ubuntu-latest)	7m 45s
build_sdist_mac (macos-latest)	2m 20s
build_sdist_win	6m 11s
build_sdist_ubuntu (ubuntu-latest)	2m 40s
build_sdist_mac_hipo (macos-latest)	3m 6s
build_sdist_win_hipo	17m 58s
	40m 0s

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