Update to libv8-node 20.x #127

Job	Run time
macos-11 - truffleruby+graalvm-head	4m 16s
macos-12 - truffleruby+graalvm-head	2m 14s
macos-11 - ruby-3.0	1m 5s
linux-amd64 - ruby-3.0 - gnu	50m 27s
ubuntu-20.04 - truffleruby+graalvm-head	1m 46s
macos-11 - ruby-3.1	39s
linux-amd64 - ruby-3.0 - musl	24s
macos-11 - ruby-3.2	41s
linux-arm64 - ruby-3.0 - gnu	6h 0m 15s
macos-12 - ruby-3.0	57s
linux-arm64 - ruby-3.0 - musl	2m 39s
linux-amd64 - ruby-3.1 - gnu	58m 31s
macos-12 - ruby-3.1	28s
macos-12 - ruby-3.2	28s
linux-amd64 - ruby-3.1 - musl	23s
linux-arm64 - ruby-3.1 - gnu	5s
linux-arm64 - ruby-3.1 - musl	2m 26s
linux-amd64 - ruby-3.2 - gnu	59m 59s
linux-amd64 - ruby-3.2 - musl	26s
linux-arm64 - ruby-3.2 - gnu	6h 0m 12s
linux-arm64 - ruby-3.2 - musl	10m 20s
	15h 18m 41s

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