fix(find_first_executable_in_path_using_cache): revert to `AsRef` #15

Job	Run time
Check generated schemas	37s
Test (macOS)	5m 16s
Test (linux/aarch64)	3m 54s
Check for unneeded dependencies	2m 14s
Source code checks (stable, macos-latest)	1m 34s
Test (linux/x86_64)	3m 44s
Source code checks (1.87.0, ubuntu-24.04)	1m 1s
Source code checks (stable, ubuntu-24.04)	1m 8s
Build (aarch64/linux)	2m 16s
Build (x86_64/linux)	3m 42s
Build (x86_64/linux-musl)	2m 24s
Source code checks (1.87.0, windows-2025)	2m 35s
Source code checks (stable, windows-2025)	2m 38s
Build (aarch64/macos)	4m 45s
Build (wasm32/unknown)	1m 9s
Build (wasm32/wasi-0.2)	1m 13s
Source code checks (1.87.0, macos-latest)	56s
Build (x86_64/windows)	2m 24s
Benchmarks	0s
Analyze public API	0s
External tests / bash-completion test suite	5m 57s
OS target tests (Fedora/latest)	26s
OS target tests (Arch Linux/latest)	24s
OS target tests (NixOS/latest)	1m 14s
OS target tests (Azure Linux/3.0)	35s
OS target tests (openSUSE Tumbleweed/latest)	37s
OS target tests (Debian/testing)	18s
	53m 1s

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