Add type t to Stdlib modules #5897

Job	Run time
build-rewatch (macos-13, x86_64-apple-darwin)	27s
build-rewatch (macos-14, aarch64-apple-darwin)	11s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true)	54s
build-rewatch (ubuntu-24.04, x86_64-unknown-linux-musl)	11s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	57s
build-rewatch (ubuntu-24.04-arm, aarch64-unknown-linux-musl)	18s
build-compiler (macos-13, 5.3.0, true)	45s
build-rewatch (windows-latest, x86_64-pc-windows-gnu)	22s
build-compiler (macos-14, 5.3.0, true)	43s
build-compiler (windows-latest, 5.3.0, true)	42s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static, true)	59s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static)	45s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static)	59s
package	1s
installationTest	1s
publish	1s
	8m 16s

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