Fix adjacency list serialise types #496

Job	Run time
windows-cmake-subdir (windows-2025)	3m 18s
windows-cmake-install (windows-2022)	4m 8s
windows-cmake-subdir (windows-2022)	2m 58s
posix-cmake-install (ubuntu-22.04)	1m 45s
posix-cmake-subdir (ubuntu-22.04)	1m 14s
posix-cmake-install (macos-14)	2m 23s
windows-cmake-install (windows-2025)	3m 58s
posix-cmake-install (macos-15)	1m 34s
macos (clang, 14)	6m 9s
posix-cmake-subdir (macos-14)	1m 25s
ubuntu (clang-19, 14)	8m 9s
posix-cmake-install (ubuntu-24.04)	1m 38s
macos (clang, 17)	6m 58s
ubuntu (gcc-14, 14)	7m 32s
posix-cmake-subdir (ubuntu-24.04)	1m 22s
macos (clang, 20)	7m 9s
posix-cmake-subdir (macos-15)	1m 40s
windows_msvc_14_3 (msvc-14.3)	22m 44s
ubuntu (clang-19, 17)	7m 22s
ubuntu (gcc-14, 23)	8m 44s
ubuntu (gcc-14, 17)	8m 1s
ubuntu (clang-19, 20)	10m 6s
ubuntu (clang-19, 23)	11m 23s
ubuntu (gcc-14, 20)	7m 50s
	2h 19m 30s

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