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Don't create a BGZF index when running the compressing converter
The index file is not used because it is generated again in `set_meta()` for the `VcfGz` datatype, and ignored for all others. Additionally, the index file is currently generated alongside the input dataset, which fails when the input directory is not writeable (such as when running in a container). Fix https://github.com/galaxyproject/galaxy/issues/13916 . Also, replace outdated `tabix` requirement with the latest `htslib`.