Bump version to 0.73.0 #2594

Job	Run time
build-windows	1m 19s
build-linux-lint	13s
build-linux-test-component (buildx)	2m 55s
build-linux-test-other	1m 0s
build-linux-test-component (test_compose.py)	7m 4s
build-linux-test-component (test_config.py)	1m 1s
Render docs	1m 25s
build-linux-test-component (test_container.py)	8m 21s
build-linux-test-component (test_context.py)	53s
build-linux-test-component (test_image.py)	1m 44s
build-linux-test-component (test_manifest.py)	53s
build-linux-test-component (test_network.py)	1m 33s
build-linux-test-component (test_node.py)	1m 26s
build-linux-test-component (test_plugin.py)	1m 0s
build-linux-test-component (test_pod.py)	1m 14s
build-linux-test-component (test_service.py)	3m 8s
build-linux-test-component (test_stack.py)	1m 36s
build-linux-test-component (test_swarm.py)	1m 21s
build-linux-test-component (test_system.py)	2m 12s
build-linux-test-component (test_task.py)	1m 8s
build-linux-test-component (test_volume.py)	59s
	42m 25s

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