Bump actions/checkout from 3 to 4 (#697) #365

Job	Run time
build-geoserver-docker-image (2, 9.0.91-jdk17-temurin-focal, /opt/java/openjdk, 26, 0, https://so...	3m 11s
build-activemq-docker-image	32s
run-scenario-tests (gwc)	1m 42s
run-scenario-tests (login)	2m 49s
run-scenario-tests (stores)	2m 36s
run-scenario-tests (context)	1m 50s
run-scenario-tests (disk-quota)	2m 21s
run-scenario-tests (jdbconfig)	2m 11s
run-scenario-tests (libjpeg)	1m 51s
scan_image	1m 27s
push-internal-pr-images	0s
	20m 30s

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