dart: set access time of existing files #340

Job	Run time
multi (ftpsync, ubuntu-24.04-arm)	44s
multi (nix-channels, ubuntu-latest)	48s
multi (tsumugu, ubuntu-24.04-arm)	1m 5s
multi (rustup-mirror, ubuntu-24.04-arm)	1m 1s
multi (ftpsync, ubuntu-latest)	38s
multi (nix-channels, ubuntu-24.04-arm)	53s
multi (tsumugu, ubuntu-latest)	57s
multi (shadowmire, ubuntu-24.04-arm)	31s
multi (rubygems-mirror, ubuntu-24.04-arm)	38s
multi (shadowmire, ubuntu-latest)	32s
multi (rustup-mirror, ubuntu-latest)	54s
multi (tunasync-scripts, ubuntu-latest)	34s
multi (tunasync-scripts, ubuntu-24.04-arm)	39s
multi (rubygems-mirror, ubuntu-latest)	31s
merge	36s
	11m 1s

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