Add type t to Stdlib modules (#7302) #5899

Job	Run time
build-rewatch (macos-13, x86_64-apple-darwin)	21s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true)	1m 55s
build-rewatch (macos-14, aarch64-apple-darwin)	10s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	3m 52s
build-compiler (macos-13, 5.3.0, true)	4m 24s
build-rewatch (ubuntu-24.04, x86_64-unknown-linux-musl)	11s
build-rewatch (ubuntu-24.04-arm, aarch64-unknown-linux-musl)	23s
build-compiler (macos-14, 5.3.0, true)	2m 41s
build-rewatch (windows-latest, x86_64-pc-windows-gnu)	25s
build-compiler (windows-latest, 5.3.0, true)	3m 45s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static, true)	1m 40s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static)	1m 37s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static)	1m 43s
package	35s
installationTest (macos-13)	40s
installationTest (macos-14)	16s
installationTest (ubuntu-24.04)	19s
installationTest (ubuntu-24.04-arm)	22s
installationTest (windows-latest)	46s
publish	0s
	26m 5s

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