Use directory instead of file when searching for uv.toml file #5385

Job	Run time
cargo fmt	1m 4s
build binary \| linux	2m 7s
cargo clippy \| ubuntu	53s
cargo test \| ubuntu	3m 57s
cargo clippy \| windows	1m 12s
build binary \| macos aarch64	1m 12s
cargo test \| macos	5m 20s
cargo test \| windows	5m 12s
check windows trampoline	5m 0s
build binary \| macos x86_64	2m 16s
build binary \| windows	1m 36s
check system \| python on macos aarch64	15s
check cache \| macos aarch64	12s
check system \| homebrew python on macos aarch64	19s
check system \| python3.13 on windows	1m 48s
check system \| embedded python3.10 on windows	24s
check system \| python3.10 on windows x86	1m 10s
check system \| python3.12 via chocolatey	1m 37s
check system \| python3.10 on windows	52s
check cache \| ubuntu	1m 20s
check system \| python on debian	52s
check system \| python on fedora	29s
check system \| python on opensuse	48s
ecosystem test \| prefecthq/prefect	1m 59s
check system \| pypy on ubuntu	25s
ecosystem test \| pallets/flask	17s
check system \| python on rocky linux	35s
check system \| python on ubuntu	16s
check system \| alpine	24s
check system \| amazonlinux	24s
check system \| python via pyenv	1m 48s
check system \| conda3.8 on linux	51s
check system \| pyston	3m 53s
check system \| conda3.11 on linux	48s
check system \| conda3.8 on windows	2m 13s
check system \| conda3.11 on windows	2m 12s
check system \| conda3.8 on macos	43s
check system \| conda3.11 on macos	54s
check system \| python on macos x86_64	16s
	57m 53s

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