New year infrastructure / CI fixes #5989

Job	Run time
lint/style-and-typos	48s
linux/3.9/bare-env	8s
linux/3.9	27m 45s
linux/3.10	3m 53s
linux/3.11	3m 51s
linux/3.12	4m 25s
linux/3.13	6m 21s
osx/3.9	15m 6s
osx/3.10	5m 44s
osx/3.11	4m 16s
osx/3.12	6m 38s
osx/3.13	5m 8s
win/3.9	33m 44s
win/3.10	37m 43s
win/3.11	33m 49s
win/3.12	22m 5s
win/3.13	20m 22s
linux/3.11/conda	25m 33s
linux/3.10/mpi	11m 2s
linux/3.12/cython	8m 5s
win/3.9/pip	32m 46s
linux/3.11/singletest	3m 54s
linux/3.9/slim	4m 16s
linux/3.12/numpy2	5m 38s
linux/3.10/pyutilib	4m 10s
linux/pypy-3.9	37m 54s
process-coverage-${{ matrix.TARGET }}	1s
	6h 5m 5s

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