Updates Tenacity to 9.0.0 #86

Job	Run time
Typing	46s
Linting	37s
Verify dev env (macos-latest)	13s
tests on 3.11	5m 58s
Build & verify package	19s
Verify dev env (windows-latest)	26s
Verify dev env (ubuntu-latest)	17s
Combine & check coverage	11s
	8m 47s

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