Upgrade the development toolchain to OCaml 5.5 #10821

Job	Run time
test-devcontainer	4m 13s
build-compiler (ubuntu-24.04, ocaml-variants.5.5.0+options,ocaml-option-static, true, true, linux...	4m 16s
build-compiler (macos-15-intel, 5.5.0, true, darwin-x64, x86_64-apple-darwin, release)	24m 19s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	3m 34s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.5.0+options,ocaml-option-static, true, true, t...	3m 23s
build-compiler (windows-2025, 5.5.0, true, win32-x64, x86_64-pc-windows-gnu, .exe, release)	20m 54s
build-compiler (macos-15, 5.5.0, true, darwin-arm64, aarch64-apple-darwin, release)	18m 29s
dev-playground	1s
api-docs	1s
pkg-pr-new	1s
test-integration-rewatch	1s
test-installation-npm	1s
test-installation-pnpm	1s
	1h 19m 14s

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