chore(deps): update dependency kubernetes-csi/external-snapshotter to v7 #313

Job	Run time
Build docker image (and publish on main) (ghcr.io/giganticminecraft/seichi_minecraft_server_produ...	7s
Build docker image (and publish on main) (ghcr.io/giganticminecraft/seichi_minecraft_server_produ...	7s
Build docker image (and publish on main) (ghcr.io/giganticminecraft/seichi_minecraft_server_debug...	9s
Build docker image (and publish on main) (ghcr.io/giganticminecraft/seichi_minecraft_server_debug...	5s
Build docker image (and publish on main) (ghcr.io/giganticminecraft/seichi_minecraft_server_debug...	13s
Build docker image (and publish on main) (ghcr.io/giganticminecraft/seichi_minecraft_server_debug...	5s
	46s

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