MAINT: dropping python 3.9 support and pytest<7 #671

Job	Run time
tests (ubuntu-latest, 3.10, py310-test-pytest71)	1m 6s
tests (ubuntu-latest, 3.10, py10-test-pytestoldest)	54s
tests (ubuntu-latest, 3.11, py311-test-pytest73)	54s
tests (windows-latest, 3.13, py313-test-pytest84)	1m 58s
tests (windows-latest, 3.11, py311-test-pytest72)	2m 5s
tests (ubuntu-latest, 3.12, py312-test-pytest82)	52s
tests (windows-latest, 3.14, py314-test-pytestdev, -v)	2m 10s
tests (ubuntu-latest, 3.12, py312-test-pytest80)	1m 3s
tests (macos-latest, 3.13, py313-test-pytest83)	58s
tests (ubuntu-latest, 3.14, py314-test-pytestdev-numpydev)	1m 5s
tests (ubuntu-latest, 3.11, py311-test-pytest74)	52s
tests (windows-latest, 3.12, py312-test-pytest81)	2m 24s
tests (ubuntu-latest, 3.13, py313-test-pytest83-pytestasyncio)	1m 1s
tests (macos-latest, 3.14, py314-test-pytestdev)	1m 1s
	18m 23s

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