buildRustPackage: fix deprecated use of registry.index config key #22987
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See
rust-lang/cargo@8214bb9
for the cargo commit which deprecated the registry.index key, and
implements this as a replacement. This gets rid of the error message
warning: custom registry support via the
registry.index
configuration is being removed, this functionality will not work in the futureI tested by faking a depsSha256 for a package using buildRustPackage, rebuilding, and verifying that