Bump version to 4.18.0-beta001 #888

Job	Run time
build-devcontainer	9m 7s
dotnet-build (Debug, ubuntu-latest)	3m 22s
dotnet-build (Debug, windows-latest)	6m 7s
fable-python-build (ubuntu-latest, 3.10)	2m 52s
fable-npm-build (ubuntu-latest, 18)	2m 13s
dotnet-build (Debug, macOS-latest)	3m 35s
fable-python-build (ubuntu-latest, 3.11)	2m 38s
fable-npm-build (ubuntu-latest, 20)	2m 9s
dotnet-build (Release, ubuntu-latest)	3m 20s
fable-python-build (ubuntu-latest, 3.12)	3m 2s
dotnet-build (Release, windows-latest)	6m 39s
fable-npm-build (ubuntu-latest, latest)	2m 15s
fable-python-build (windows-latest, 3.10)	5m 7s
dotnet-build (Release, macOS-latest)	3m 17s
fable-npm-build (windows-latest, 18)	5m 5s
fable-python-build (windows-latest, 3.11)	5m 20s
fable-npm-build (windows-latest, 20)	6m 30s
fable-python-build (windows-latest, 3.12)	5m 38s
fable-npm-build (windows-latest, latest)	6m 38s
fable-python-build (macOS-latest, 3.10)	2m 18s
fable-npm-build (macOS-latest, 18)	2m 3s
fable-python-build (macOS-latest, 3.11)	3m 20s
fable-npm-build (macOS-latest, 20)	1m 35s
fable-python-build (macOS-latest, 3.12)	1m 41s
fable-npm-build (macOS-latest, latest)	2m 6s
	1h 37m 57s

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