New year infrastructure / CI fixes #5992

Job	Run time
lint/style-and-typos	50s
linux/3.9/bare-env	12s
linux/3.9	7m 10s
linux/3.10	7m 13s
linux/3.11	7m 11s
linux/3.12	7m 11s
linux/3.13	7m 13s
osx/3.9	7m 17s
osx/3.10	7m 16s
osx/3.11	7m 16s
osx/3.12	7m 16s
osx/3.13	7m 14s
win/3.9	1m 1s
win/3.10	7m 10s
win/3.11	6m 52s
win/3.12	4m 46s
win/3.13	1m 1s
linux/3.11/conda	7m 10s
linux/3.10/mpi	7m 3s
linux/3.12/cython	7m 13s
win/3.9/pip	1s
linux/3.11/singletest	7m 19s
linux/3.9/slim	5m 12s
linux/3.12/numpy2	5m 57s
linux/3.10/pyutilib	7m 16s
linux/pypy-3.9	2m 15s
process-coverage-${{ matrix.TARGET }}	1s
	2h 23m 36s

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