findSourceMap only throws on node 19+ #123

Job	Run time
build (16.x, ubuntu-latest, bash)	1m 42s
build (16.x, macos-latest, bash)	2m 6s
build (16.x, windows-latest, bash)	2m 12s
build (16.x, windows-latest, powershell)	2m 16s
build (18.x, ubuntu-latest, bash)	1m 28s
build (18.x, macos-latest, bash)	1m 58s
build (18.x, windows-latest, bash)	2m 7s
build (18.x, windows-latest, powershell)	2m 0s
build (20.x, ubuntu-latest, bash)	1m 23s
build (20.x, macos-latest, bash)	2m 3s
build (20.x, windows-latest, bash)	1m 58s
build (20.x, windows-latest, powershell)	2m 33s
	23m 46s

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