Add warning to `flake8-to-ruff` #28

Job	Run time
macos-x86_64	5m 58s
macos-universal	5m 12s
linux (x86_64)	4m 59s
linux-cross (aarch64)	7m 10s
linux (i686)	6m 52s
musllinux (x86_64-unknown-linux-musl)	4m 49s
linux-cross (armv7)	7m 49s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	5m 53s
musllinux (i686-unknown-linux-musl)	5m 13s
linux-cross (s390x)	8m 42s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	5m 56s
windows (x64)	7m 49s
linux-cross (ppc64le)	7m 35s
windows (x86)	7m 36s
linux-cross (ppc64)	5m 37s
	1h 37m 10s

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