Remove or protect all use of weak hash. #10436

Job	Run time
build_details	3s
pre-commit	3m 3s
build_js	1m 27s
build_no_depopts	8m 32s
update_doc	0s
lezer_parse	49s
tree_sitter_parse	47s
build_opam (5.1.x)	5m 0s
build_win32 (x64)	19m 41s
build_posix (debian_trixie, amd64)	12m 25s
build_posix (debian_bookworm, amd64)	11m 45s
build_posix (ubuntu_jammy, amd64)	13m 25s
run_tests (@citest)	6h 0m 4s
build_posix (ubuntu_lunar, amd64)	12m 10s
run_tests (@doctest)	7m 52s
build_posix (alpine, amd64)	8m 1s
run_tests (@mediatest)	11m 22s
fetch_s3_artifacts	26s
build_docker_alpine_minimal	0s
update_release	0s
build_docker_minimal	0s
build_docker	0s
build_docker_alpine	0s
build_docker_release-minimal	0s
build_docker_release	0s
	7h 56m 52s

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