Update actions/checkout action to v5 (#297) #239

Job	Run time
test	57s
build-arch (linux/amd64, ubuntu-latest, http)	29s
build-arch (linux/amd64, ubuntu-latest, socketio)	25s
build-arch (linux/amd64, ubuntu-latest, migrations)	21s
build-arch (linux/arm64, ubuntu-24.04-arm, migrations)	35s
build-arch (linux/amd64, ubuntu-latest, dramatiq)	27s
build-arch (linux/arm64, ubuntu-24.04-arm, dramatiq)	33s
build-arch (linux/arm64, ubuntu-24.04-arm, socketio)	29s
build-arch (linux/arm64, ubuntu-24.04-arm, http)	31s
aggregate-manifests (http)	39s
aggregate-manifests (migrations)	26s
aggregate-manifests (socketio)	29s
aggregate-manifests (dramatiq)	35s
	6m 56s

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