refactor: run `dprint` on `Dockerfile` #149

Job	Run time
Minimum supported rust version	2m 5s
Code quality	1m 52s
Build for linux-gnu	2m 32s
Build for win-gnu	5m 10s
Build for win-msvc	4m 46s
Build for win32-msvc	4m 50s
Build for macos	6m 56s
	28m 11s

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