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Update actions/checkout action to v6 (#310) #242

Job	Run time
test	2m 35s
build-arch (linux/arm64, ubuntu-24.04-arm, dramatiq)	2m 36s
build-arch (linux/arm64, ubuntu-24.04-arm, http)	2m 38s
build-arch (linux/amd64, ubuntu-latest, http)	2m 17s
build-arch (linux/arm64, ubuntu-24.04-arm, migrations)	2m 32s
build-arch (linux/amd64, ubuntu-latest, migrations)	2m 28s
build-arch (linux/amd64, ubuntu-latest, dramatiq)	2m 3s
build-arch (linux/amd64, ubuntu-latest, socketio)	2m 9s
build-arch (linux/arm64, ubuntu-24.04-arm, socketio)	2m 30s
aggregate-manifests (migrations)	21s
aggregate-manifests (socketio)	39s
aggregate-manifests (dramatiq)	28s
aggregate-manifests (http)	35s
	23m 51s