build

Fix support for OCaml 5.3 #2928

Job	Run time
lint-fmt	2m 55s
lint-opam	3m 54s
build (ubuntu-latest, 4.08, true, true, true)	3m 9s
build (ubuntu-latest, 4.09, true, true, true)	3m 16s
lint-runtime	8s
build (ubuntu-latest, 4.10, true, true, true)	3m 16s
build (ubuntu-latest, 4.11, true, true, true)	3m 24s
build (ubuntu-latest, 4.12, true, true, true)	3m 9s
build (ubuntu-latest, 4.13, true, true, true)	3m 6s
build (ubuntu-latest, 5.0, true, true, true)	2m 59s
build (ubuntu-latest, 5.1, true, true, true)	3m 6s
build (ubuntu-latest, 4.14, true, false, true)	7m 34s
build (macos-latest, 4.14, true, false, true)	10m 1s
build (windows-latest, 4.14, true, false, true)	17m 5s
build (ubuntu-latest, 5.2, false, false, false)	11m 18s
build (macos-latest, 5.2, true, false, true)	9m 24s
build (windows-latest, 5.2, false, false, true)	23m 44s
	1h 51m 28s

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