Don't error on multiple matching index URLs #3853

Job	Run time
build binary \| linux	1m 34s
cargo fmt	27s
cargo test \| ubuntu	3m 48s
cargo clippy (ubuntu-latest)	46s
cargo test \| windows	4m 52s
check windows trampoline	4m 9s
cargo clippy (windows-latest)	4m 17s
cargo test \| macos	4m 58s
build binary \| macos aarch64	1m 6s
build binary \| macos x86_64	1m 57s
build binary \| windows	5m 22s
check system \| python on macos aarch64	54s
check system \| python on fedora	47s
check system \| python on ubuntu	16s
check system \| python on centos	35s
check system \| amazonlinux	23s
check system \| python on debian	42s
check system \| alpine	18s
check system \| python via pyenv	1m 43s
check system \| pypy on ubuntu	32s
check system \| pyston	3m 54s
check system \| python on macos x86_64	17s
check system \| python3.12 via chocolatey	47s
check system \| conda3.8 on linux	32s
check system \| python3.10 on windows	31s
check system \| conda3.11 on linux	33s
check system \| python3.13 on windows	1m 7s
check system \| conda3.8 on windows	1m 45s
check system \| conda3.11 on windows	1m 43s
check system \| conda3.8 on macos	40s
check system \| conda3.11 on macos	40s
	51m 55s

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