Replace deprecated `imghdr` package with `filetype` #161

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Job	Run time
Style	8s
ubuntu-latest: py37-test	20s
ubuntu-latest: py38-test	14s
windows-latest: py38-test	46s
ubuntu-latest: py39-test	18s
windows-latest: py39-test	34s
ubuntu-latest: py310-test	14s
windows-latest: py310-test	52s
ubuntu-latest: pypy-test	35s
	4m 1s