Add `deprecated` to Python 3.7 dependency installation step #1138

Job	Run time
run-test-suite (ubuntu-latest, 3.9, latest)	12m 17s
run-test-suite (ubuntu-22.04, 3.7, 9.1)	9m 17s
run-test-suite (ubuntu-latest, 3.9, 9.4)	11m 46s
run-test-suite (ubuntu-latest, 3.13, latest)	11m 37s
	44m 57s

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