fileutils: add type hints #1955

Job	Run time
system (ubuntu:noble)	13m 17s
system-installed	14m 46s
skip (ubuntu:noble)	2m 36s
system (ubuntu:oracular)	12m 26s
linter	1m 36s
skip (ubuntu:oracular)	2m 29s
system (ubuntu:plucky)	13m 31s
skip (ubuntu:plucky)	2m 42s
unit-and-integration (debian:bookworm-slim)	3m 0s
unit-and-integration-installed	3m 22s
unit-and-integration (debian:testing-slim)	3m 25s
woke	4s
unit-and-integration (ubuntu:noble)	3m 22s
unit-and-integration (ubuntu:oracular)	3m 6s
unit-and-integration (ubuntu:plucky)	3m 25s
upload-to-codecov	12s
	1h 23m 19s

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