update ppxlib to 0.35 #5634

Job	Run time
Native packages (Linux, OCaml 4_14)	34m 13s
nix-fmt-check	1m 39s
Native packages (macOS (macos-13), OCaml 5_1)	1h 21m 21s
Native packages (Linux, OCaml 5_1)	32m 6s
arm64 packages (OCaml 4_14)	7m 50s
Native packages (macOS (macos-13), OCaml 5_2)	1h 57m 10s
Native packages (Linux, OCaml 5_2)	31m 15s
musl packages (OCaml 4_14)	6m 4s
Native packages (macOS (macos-13), OCaml 5_3)	1h 54m 47s
Native (Top-level) packages (ubuntu-latest)	4m 42s
Native packages (Linux, OCaml 5_3)	30m 31s
Native packages (macOS (macos-14), OCaml 4_14)	51m 7s
arm64 packages (OCaml 5_1)	9m 38s
Native (Top-level) packages (macos-13)	10m 13s
Native (Top-level) packages (macos-14)	4m 54s
Native packages (macOS (macos-14), OCaml 5_1)	47m 45s
musl packages (OCaml 5_1)	6m 21s
Native packages (macOS (macos-14), OCaml 5_2)	57m 23s
arm64 packages (OCaml 5_2)	10m 2s
Native packages (macOS (macos-14), OCaml 5_3)	55m 50s
musl packages (OCaml 5_2)	5m 49s
arm64 packages (OCaml 5_3)	9m 8s
musl packages (OCaml 5_3)	6m 21s
	12h 16m 9s

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