Drop requirements.txt files #624

Job	Run time
Conda Python py311 on ubuntu-latest	5m 43s
Conda Python py311 on macos-latest	3m 17s
Conda Python py311 on windows-latest	10m 9s
Vanilla Python 3.11 on ubuntu-latest	5m 58s
Conda Python py312 on ubuntu-latest	5m 57s
Vanilla Python 3.11 on macos-latest	3m 7s
Conda Python py312 on macos-latest	4m 0s
Vanilla Python 3.12 on ubuntu-latest	7m 26s
Conda Python py312 on windows-latest	9m 57s
Vanilla Python 3.12 on macos-latest	3m 48s
Non-JIT test coverage	4m 22s
Evaluation-based tests	9m 44s
Minimal dependency tests	5m 57s
FunkSVD tests on Python py311	47s
Minimal dependency tests for FunkSVD	6m 19s
HPF bridge tests on Python py311	47s
FunkSVD tests on Python py312	41s
Implicit bridge tests on Python py311	37s
HPF bridge tests on Python py312	49s
Implicit bridge tests on Python py312	42s
Minimal dependency tests for Implicit	5m 59s
Demos, examples, and docs	2m 49s
Test suite results	7s
	1h 39m 2s

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