actions: work around sched boost warning issue #76

Job	Run time
Generate build matrix	7s
python linting	42s
validate commits	0s
spelling	15s
bookworm	2m 19s
bookworm - 32 bit	2m 12s
bookworm - gcc-12,content-s3,distcheck	2m 14s
bookworm - py3.11,clang-15	2m 30s
coverage	2m 12s
jammy - test-install	2m 37s
bookworm - test-install	2m 15s
focal - py3.8	1m 48s
el8	2m 0s
el8 - ascii	1m 58s
el8 - system,coverage	2m 18s
fedora34 - gcc-11.2,py3.9	2m 10s
fedora38 - gcc-13.1,py3.11	1m 28s
inception	2m 2s
flux-accounting check	2m 11s
flux-sched check	1m 45s
	35m 3s

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