New year infrastructure / CI fixes #6000

Job	Run time
lint/style-and-typos	52s
linux/3.9/bare-env	10s
linux/3.9	19m 5s
linux/3.10	19m 3s
linux/3.11	19m 3s
linux/3.12	19m 2s
linux/3.13	19m 4s
osx/3.9	15m 5s
osx/3.10	17m 8s
osx/3.11	16m 31s
osx/3.12	18m 9s
osx/3.13	16m 0s
win/3.9	9m 12s
win/3.10	18m 40s
win/3.11	18m 26s
win/3.12	13m 30s
win/3.13	11m 45s
linux/3.11/conda	19m 3s
linux/3.10/mpi	9m 44s
linux/3.12/cython	19m 2s
win/3.9/pip	3m 45s
linux/3.11/singletest	19m 2s
linux/3.9/slim	5m 6s
linux/3.12/numpy2	7m 3s
linux/3.10/pyutilib	19m 3s
linux/pypy-3.10	18m 49s
process-coverage-${{ matrix.TARGET }}	1s
	6h 11m 23s

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