use Node.js 20 for the bundled test #1153

Job	Run time
bundled_gdal_coverage	5m 47s
test_distros_bundled (amazonlinux:2022)	15m 57s
test_node (16, shared)	3m 46s
test_distros_bundled (ubuntu:24.04)	8m 31s
test_asan	4m 3s
test_node (16, bundled)	4m 0s
test_distros_shared (ubuntu:20.04)	3m 59s
test_node (18, shared)	3m 49s
test_distros_shared (ubuntu:22.04)	3m 33s
test_mac_debug	6m 58s
test_node (18, bundled)	3m 51s
test_mac (16.x)	5m 36s
test_distros_shared (ubuntu:24.04)	3m 50s
test_node (20, shared)	3m 39s
test_distros_shared (debian:bullseye)	3m 49s
test_mac (18.x)	5m 14s
test_node (20, bundled)	3m 56s
test_distros_shared (fedora:37)	6m 43s
test_mac (20.x)	4m 59s
test_node (22, shared)	3m 52s
test_win (16.x)	24m 59s
test_distros_shared (centos:stream9)	4m 51s
test_node (22, bundled)	3m 47s
test_mac (22.x)	25s
test_win (18.x)	20m 33s
test_win (20.x)	22m 16s
test_win (22.x)	20m 55s
test_win_debug	19m 42s
	3h 43m 20s

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