Use git version of ocaml-pandoc for now. #9182

Job	Run time
build_js	3m 37s
pre-commit	5m 10s
build_details	2s
build_no_depopts	6m 56s
tree_sitter_parse	2m 25s
lezer_parse	51s
build_opam (4.14.x)	4m 54s
build_posix (debian_trixie, amd64)	13m 36s
run_tests (@citest)	13m 56s
update_doc	0s
run_tests (@doctest)	8m 5s
build_posix (debian_bookworm, amd64)	13m 50s
run_tests (@mediatest)	13m 55s
build_posix (ubuntu_jammy, amd64)	13m 21s
build_opam (5.0.x)	7m 5s
build_posix (ubuntu_lunar, amd64)	14m 9s
build_posix (alpine, amd64)	9m 41s
build_win32 (x64)	11m 15s
fetch_s3_artifacts	25s
build_docker (amd64)	3m 26s
build_docker_alpine (amd64)	1m 9s
update_release	0s
build_docker_alpine_minimal (amd64)	1m 41s
build_docker_minimal (amd64)	3m 40s
build_docker_release	0s
build_docker_release-minimal	0s
	2h 33m 9s

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