switch to node.js20 package.json #314

Job	Run time
build-and-test / build (25.X, x64, rolling)	14m 8s
build-and-test / build (24.X, x64, kilted)	8m 4s
build-and-test / build (24.X, x64, jazzy)	7m 26s
build-and-test / build (24.X, x64, humble)	6m 46s
build-and-test / build (25.X, x64, kilted)	8m 17s
build-and-test / build (25.X, x64, jazzy)	7m 5s
build-and-test / build (24.X, x64, rolling)	14m 3s
build-and-test / build (25.X, x64, humble)	6m 43s
	1h 12m 32s

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