Use pinned flow_parser #6431

Job	Run time
build-rewatch (macos-13, x86_64-apple-darwin)	24s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true)	12m 57s
build-rewatch (macos-14, aarch64-apple-darwin)	12s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	11m 8s
build-rewatch (ubuntu-24.04, x86_64-unknown-linux-musl)	7s
build-compiler (macos-13, 5.3.0, true)	20m 28s
build-rewatch (ubuntu-24.04-arm, aarch64-unknown-linux-musl)	17s
build-compiler (macos-14, 5.3.0, true)	11m 35s
build-rewatch (windows-latest, x86_64-pc-windows-gnu)	31s
build-compiler (windows-latest, 5.3.0, true)	11m 14s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static)	12m 25s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static)	11m 59s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static)	12m 28s
package	39s
installationTest (macos-13)	33s
installationTest (macos-14)	18s
installationTest (ubuntu-24.04)	12s
installationTest (ubuntu-24.04-arm)	26s
installationTest (windows-latest)	53s
publish	0s
	1h 48m 46s

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