[red-knot] Anchor relative paths in configurations #39381

Job	Run time
cargo fmt	18s
Determine changes	12s
cargo build (release)	0s
mkdocs	2m 46s
pre-commit	3m 15s
python package	1m 19s
cargo clippy	1m 53s
cargo test (windows)	4m 50s
cargo test (linux, release)	3m 58s
cargo test (linux)	1m 47s
benchmarks	4m 59s
cargo build (msrv)	4m 15s
cargo fuzz build	4m 54s
cargo shear	22s
cargo test (wasm)	1m 48s
formatter instabilities and black similarity	0s
test scripts	1m 4s
ecosystem	2m 40s
test ruff-lsp	46s
fuzz parser	0s
	41m 6s

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