feat: remove Node.js 18 from supported versions (#544) #55

Job	Run time
Run tests / build (macos-latest, lts/*)	3m 2s
Run tests / build (windows-latest, lts/-1)	3m 37s
Run tests / build (windows-latest, lts/*)	3m 13s
Run tests / build (ubuntu-latest, lts/*)	1m 27s
Run tests / build (ubuntu-latest, lts/-1)	1m 43s
Run tests / build (macos-latest, lts/-1)	1m 42s
Run release work	2m 24s
	17m 8s

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