DEP: refactored out runtime dependency on setuptools #476

Job	Run time
tests (ubuntu-latest, 3.8, py38-test-pytestoldest)	46s
tests (windows-latest, 3.8, py38-test-pytest50)	1m 54s
tests (macos-12, 3.8, py38-test-pytest51)	1m 9s
tests (ubuntu-latest, 3.8, py38-test-pytest52)	49s
tests (windows-latest, 3.8, py38-test-pytest53)	1m 55s
tests (ubuntu-latest, 3.8, py38-test-pytest60)	52s
tests (ubuntu-latest, 3.9, py39-test-pytest61)	44s
tests (ubuntu-latest, 3.9, py39-test-pytest62)	46s
tests (ubuntu-latest, 3.10, py310-test-pytest70)	48s
tests (ubuntu-latest, 3.10, py310-test-pytest71)	50s
tests (windows-latest, 3.11, py311-test-pytest72)	2m 6s
tests (ubuntu-latest, 3.11, py311-test-pytest73)	48s
tests (ubuntu-latest, 3.11, py311-test-pytest74)	41s
tests (ubuntu-latest, 3.12, py312-test-pytest80)	56s
tests (windows-latest, 3.12, py312-test-pytest81)	1m 57s
tests (ubuntu-latest, 3.12, py312-test-pytest82)	55s
tests (macos-latest, 3.12, py312-test-pytest82)	39s
tests (windows-latest, 3.12, py312-test-pytest82)	1m 43s
tests (macos-latest, 3.11, py311-test-pytestdev)	28s
tests (windows-latest, 3.11, py311-test-pytestdev)	1m 48s
tests (ubuntu-latest, 3.12, py312-test-pytestdev-numpydev)	49s
	23m 23s

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