use Node 18 for bundled tests #1177

Job	Run time
test_node (16, shared)	4m 40s
test_node (16, bundled)	11m 5s
test_distros_bundled (amazonlinux:2022)	16m 34s
bundled_gdal_coverage	15m 37s
test_distros_bundled (ubuntu:24.04)	8m 37s
test_asan	18m 49s
test_node (18, shared)	4m 39s
test_node (18, bundled)	9m 57s
test_node (20, shared)	4m 29s
test_distros_shared (ubuntu:20.04)	57s
test_mac (16.x)	1s
test_distros_shared (ubuntu:22.04)	1s
test_node (20, bundled)	5m 24s
test_mac_debug	11m 42s
test_mac (18.x)	1s
test_distros_shared (ubuntu:24.04)	7s
test_node (22, shared)	3m 29s
test_mac (20.x)	1s
test_distros_shared (debian:bullseye)	1m 35s
test_node (22, bundled)	4m 41s
test_mac (22.x)	1s
test_distros_shared (fedora:37)	1m 13s
test_win (16.x)	10m 51s
test_distros_shared (centos:stream9)	2m 27s
test_win (18.x)	1s
test_win_debug	1s
test_win (20.x)	1s
test_win (22.x)	1s
	2h 17m 2s

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