Compiler failure for VCFReader

[mfansler]

While trying to get this built for Bioconda, we see the following compilation error during the souporcell build:

error[E0277]: `vcf::VCFReader<Box<dyn BufRead>>` is not an iterator
   --> src/main.rs:320:19
    |
320 |     for record in vcf_reader {
    |                   ^^^^^^^^^^ `vcf::VCFReader<Box<dyn BufRead>>` is not an iterator
    |
    = help: the trait `Iterator` is not implemented for `vcf::VCFReader<Box<dyn BufRead>>`
    = note: required for `vcf::VCFReader<Box<dyn BufRead>>` to implement `IntoIterator`

Compilation is using Rust v1.84.0 on linux-64 platform.

Note that troublet compiles without issue.

[mfansler]

This appears to be due to vcf version. Constraining to the version shown in lock file (v0.1.0) resolves the issue.