broker: add year to log timestamps #10144

Job	Run time
Generate build matrix	10s
python linting	46s
validate commits	23s
spelling	7s
bookworm - test-install	12m 58s
bookworm - 32 bit	13m 15s
noble - test-install	12m 46s
el9 - test-install	12m 49s
alpine - test-install	12m 34s
fedora40 - test-install	12m 39s
jammy - test-install	11m 59s
focal - py3.8	17m 36s
bookworm - gcc-12,content-s3,distcheck	19m 50s
fedora40 - clang-18	17m 24s
coverage	25m 6s
el8 - ascii	19m 40s
el8 - test-install	15m 2s
el8 - system,coverage	7m 1s
inception	21m 54s
flux-pmix check	13m 39s
flux-pam check	4m 16s
macos build only	8m 29s
flux-accounting check	4m 55s
flux-sched check	6m 39s
Generate docker manifest	1s
	4h 31m 58s

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