Bump up Node.js v20.15.1 #1734

Job	Run time
build (production)	3m 32s
build (test)	2m 37s
Libvips tests (3.1)	2m 1s
End to End testing (3.1)	4m 57s
Elastic Search integration testing (3.1, 7.17.15, docker.elastic.co/elasticsearch/elasticsearch:7...	3m 20s
test (3.1)	5m 54s
Libvips tests (3.2)	1m 55s
End to End testing (3.2)	5m 1s
Elastic Search integration testing (3.2, 7.17.15, docker.elastic.co/elasticsearch/elasticsearch:7...	3m 3s
test (3.2)	5m 48s
Libvips tests (3.3)	4m 30s
End to End testing (3.3)	7m 20s
Elastic Search integration testing (3.3, 7.17.15, docker.elastic.co/elasticsearch/elasticsearch:7...	5m 14s
test (3.3)	7m 43s
End to End testing (head)	5m 5s
Libvips tests (head)	2m 16s
Elastic Search integration testing (head, 7.17.15, docker.elastic.co/elasticsearch/elasticsearch:...	3m 19s
test (head)	5m 56s
	1h 19m 31s

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