[`refurb`] Mark fix as unsafe when the right-hand side is a string (`FURB171`) #38214

Job	Run time
Determine changes	9s
mkdocs	2m 28s
cargo fmt	19s
cargo build (release)	0s
pre-commit	3m 11s
python package	1m 13s
cargo clippy	1m 52s
cargo build (msrv)	4m 3s
cargo fuzz build	5m 15s
benchmarks	4m 46s
cargo shear	22s
cargo test (linux)	2m 8s
cargo test (linux, release)	3m 47s
cargo test (wasm)	1m 38s
cargo test (windows)	4m 43s
formatter instabilities and black similarity	0s
test scripts	1m 3s
ecosystem	2m 42s
test ruff-lsp	38s
fuzz parser	0s
	40m 17s

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