Fix sourcedirs.json generation #7643

Job	Run time
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	2m 21s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static, linux-x64, x86_64...	2m 21s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	2m 35s
build-compiler (windows-latest, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	6m 42s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	1m 56s
build-compiler (macos-14, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	3m 21s
build-compiler (macos-13, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	6m 28s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	5m 32s
pkg-pr-new	53s
api-docs	2m 11s
test-installation-npm (ubuntu-24.04)	16s
test-installation-npm (macos-13)	25s
test-installation-pnpm (macos-13)	20s
test-installation-pnpm (windows-latest)	30s
test-installation-pnpm (ubuntu-24.04-arm)	14s
test-installation-pnpm (ubuntu-24.04)	14s
test-integration-rewatch (windows-latest)	1m 9s
test-installation-npm (macos-14)	18s
test-installation-npm (windows-latest)	1m 32s
test-integration-rewatch (macos-13)	1m 2s
test-installation-npm (ubuntu-24.04-arm)	16s
test-integration-rewatch (ubuntu-24.04-arm)	38s
test-integration-rewatch (ubuntu-24.04)	35s
test-integration-rewatch (macos-14)	2m 3s
test-installation-pnpm (macos-14)	18s
publish	0s
	44m 10s

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