[22.01] Don't create a BGZF index when running the compressing converter

[mvdbeek]

Backport of #13969

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 #13916 .

Also, replace outdated tabix requirement with the latest htslib.

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