Drop PyPI `mkl` runtime dep (fixes downstream `pip check`) #1030

Job	Run time
build_windows (3.11)	1m 57s
build_windows (3.13)	2m 43s
build_windows (3.14)	1m 50s
build_windows (3.12)	1m 42s
build_windows (3.10)	1m 51s
build_linux (3.10)	3m 57s
build_linux (3.11)	3m 45s
build_linux (3.13)	3m 34s
build_linux (3.12)	3m 22s
build_linux (3.14)	3m 49s
test_windows	-1s
test_linux (3.12, false, ubuntu-latest)	1m 4s
test_linux (3.13, false, ubuntu-latest)	1m 14s
test_linux (3.11, false, ubuntu-latest)	1m 22s
test_linux (3.10, false, ubuntu-latest)	1m 2s
test_linux (3.14, false, ubuntu-latest)	1m 9s
build_windows (3.10)	5m 46s
build_windows (3.12)	5m 23s
build_windows (3.13)	5m 5s
build_windows (3.14)	4m 35s
build_windows (3.11)	6m 15s
build_linux (3.11)	3m 45s
test_linux (3.13, false, ubuntu-latest)	1m 6s
test_linux (3.11, false, ubuntu-latest)	1m 9s
test_linux (3.10, false, ubuntu-latest)	1m 9s
test_linux (3.14, false, ubuntu-latest)	1m 5s
build_linux (3.13)	3m 34s
test_linux (3.12, false, ubuntu-latest)	1m 21s
build_linux (3.14)	3m 49s
build_linux (3.12)	3m 22s
build_linux (3.10)	3m 57s
test_windows (3.13, false, windows-latest)	2m 40s
test_windows (3.10, false, windows-latest)	2m 47s
test_windows (3.12, false, windows-latest)	2m 44s
test_windows (3.14, false, windows-latest)	2m 41s
test_windows (3.11, false, windows-latest)	2m 11s
	1h 38m 44s

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