ci: build 4.13.x #485

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Job	Run time
Build (4.06.x, ubuntu-latest)	4m 38s
Build (4.10.x, ubuntu-latest)	2m 13s
Build (4.12.x, ubuntu-latest)	2m 15s
Build (4.13.x, ubuntu-latest)	2m 12s
Build (4.14.x, ubuntu-latest)	3m 4s
Build (ocaml-base-compiler.5.3.0~beta2, ubuntu-latest)	2m 25s
Build (4.06.x, macos-13)	8m 5s
Build (ocaml-base-compiler.5.3.0~beta2, macos-13)	7m 32s
Build (ocaml-base-compiler.5.3.0~beta2, macos-14)	3m 52s
Build (4.14.x, windows-latest)	5m 43s
	41m 59s

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