file_util: fix broken symlink on Windows #8063

Job	Run time
build (no git)	1m 37s
test (windows-x86_64)	18m 16s
test (macos-x86_64)	16m 31s
test (macos-aarch64)	6m 0s
test (linux-aarch64-gnu)	5m 52s
test (linux-x86_64-gnu)	6m 33s
check (protos)	44s
nix flake (ubuntu-24.04)	8m 3s
check (rustfmt)	30s
test (windows-aarch64)	15m 0s
nix flake (macos-14)	13m 45s
nix flake (ubuntu-24.04-arm)	7m 35s
check (codespell)	13s
check (latest mkdocs, optional)	18s
check (cargo-deny, bans)	26s
check (Cargo.lock dependency count)	4s
check (cargo-deny, sources)	22s
check (mkdocs)	15s
check (doctests)	3m 6s
check (cargo-deny, advisories)	27s
check (clippy)	1m 31s
check (cargo-deny, licenses)	29s
check (zizmor)	15s
required checks (merge queue)	-1s
	1h 47m 51s

Provide feedback