Avoid pre-fetching for unbounded minimum versions #7749

Job	Run time
cargo fmt	25s
Determine changes	6s
cargo clippy \| ubuntu	49s
cargo clippy \| windows	1m 1s
cargo shear	26s
cargo test \| ubuntu	3m 43s
cargo test \| macos	3m 55s
cargo test \| windows	5m 54s
check windows trampoline	2m 40s
build binary \| linux	1m 43s
build binary \| macos aarch64	1m 7s
build binary \| macos x86_64	1m 34s
build binary \| windows	1m 52s
benchmarks	4m 53s
integration test \| conda on ubuntu	41s
check cache \| ubuntu	47s
ecosystem test \| prefecthq/prefect	2m 3s
integration test \| github actions	8s
ecosystem test \| pallets/flask	11s
check system \| python on fedora	32s
check system \| python on debian	45s
check system \| python on opensuse	37s
check system \| python on rocky linux 8	35s
check system \| python on ubuntu	14s
check system \| python on rocky linux 9	28s
check system \| alpine	30s
check system \| amazonlinux	31s
check system \| python via pyenv	1m 43s
check system \| pypy on ubuntu	28s
check system \| pyston	3m 53s
check system \| python3.12 via chocolatey	1m 10s
check system \| python3.10 on windows x86	36s
check system \| python3.10 on windows	34s
check system \| embedded python3.10 on windows	24s
check system \| python3.13 on windows	1m 13s
check system \| python on macos aarch64	35s
check cache \| macos aarch64	11s
check system \| homebrew python on macos aarch64	18s
check system \| conda3.8 on linux	40s
check system \| conda3.11 on linux	42s
check system \| conda3.8 on windows	3m 19s
check system \| conda3.11 on windows	2m 31s
check system \| conda3.8 on macos	45s
check system \| conda3.11 on macos	43s
check system \| python on macos x86_64	23s
	58m 18s

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