vendor: bump fileutils to v0.5.0

[kolyshkin]

No description provided.

[kolyshkin]

rebased on top of current master (merged #2580 should fix CI)

[AkihiroSuda]

Untracked files:
  (use "git add <file>..." to include in what will be committed)
	vendor/github.com/mrunalp/fileutils/go.mod
nothing added to commit but untracked files present (use "git add" to track)
error: vendor/, go.mod and/or go.sum not up to date. Run "make vendor" to update
Makefile:135: recipe for target 'verify-dependencies' failed
make: *** [verify-dependencies] Error 1
The command "make verify-dependencies" exited with 2.