Update column for species in GTDB source

[jplfaria]

Summary

In the current implementation the species level GTDB terms have mappings to NCBI taxonomy IDs. This is done by retrieving the NCBI taxon IDs from the column ncbi_taxid in the source files:

#: AR stands for archea
GTDB_AR_URL = "https://data.gtdb.ecogenomic.org/releases/latest/ar53_metadata.tsv.gz"
#: BAC stands for bacteria
GTDB_BAC_URL = "https://data.gtdb.ecogenomic.org/releases/latest/bac120_metadata.tsv.gz"

I recently realized there is a specific column named ncbi_species_taxid and that the current ncbi_taxid doesnt always represent NCBI taxonomy at the species level. The correct column ncbi_species_taxid should be the one used for this purpose.

I want to use ncbi_taxid for a different purpose but that will be part of a different PR/discussion. For now the goal of this PR is to fix the current implemententation to correctly map to ncbi_species_taxid as originally intended.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
src/pyobo/sources/gtdb.py	0.00%	1 Missing ⚠️

Additional details and impacted files

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  Coverage        ?   51.64%           
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  Files           ?      182           
  Lines           ?    11763           
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  Misses          ?     5478           
  Partials        ?      210           

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[cthoyt]

@jplfaria thanks!