[draft] Add borrowing for fs_utf8::Dir #1676

Job	Run time
Check Cross-Compilation (stable)	58s
Check Cross-Compilation on Windows (stable)	51s
Check Cross-Compilation (beta)	43s
Check Cross-Compilation on Rust nightly (nightly)	56s
Check Cross-Compilation on Windows (beta)	45s
Check Cross-Compilation on Rust nightly on Windows (nightly)	53s
Fuzz Targets	54s
Rustfmt	4s
Test (stable)	12s
Test linux-raw support (ubuntu)	16s
Test (msrv)	1m 50s
Test linux-raw support (ubuntu-20.04)	20s
Test (windows-latest)	17s
Test on Musl (ubuntu)	30s
Test (windows-2019)	19s
Test (macos-latest)	12s
Test with Rust nightly (ubuntu)	18s
Test (macos-11)	1s
Test with Rust nightly (windows)	29s
Test (beta)	16s
Test (ubuntu-20.04)	16s
Test (aarch64-ubuntu)	30s
	11m 50s

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