nodejs_20: unbreak on x86_64-darwin

Changed files
+3
pkgs
development
web
nodejs
+3
pkgs/development/web/nodejs/nodejs.nix
···
"test-fs-readv-sync"
"test-vm-memleak"
]
+
++ lib.optional (
+
stdenv.buildPlatform.isDarwin && stdenv.buildPlatform.isx86_64 && majorVersion == "20"
+
) "test-tick-processor-arguments" # flaky
)
}"
];