update ncbi endpoint

[KaiAragaki]

The NBCI taxonomy endpoint must have changed at one point, causing calls to db_download_ncbi to fail. This fixes this.

Related Issue

May be an alternate solution to #72 (since the impetus was timeout on download)

Examples

Might be wise to add some kind of test like

"ftp://ftp.ncbi.nlm.nih.gov/pub/taxonomy/taxdmp.zip" |> curl_fetch_memory()

And test for no error. Might also be wise to somehow link the test URL and the package function URL so that a change in the function would invalidate the test. Seemed kinda out of scope though and also I'm not terribly sure how to do this well, so we're flying testless.

[stitam]

Thanks @KaiAragaki for opening this PR and apologies for the delay in my response.

I have checked both URLs in my browser and their contents seem to be identical (which is strange):

https://ftp.ncbi.nih.gov/pub/taxonomy/
https://ftp.ncbi.nlm.nih.gov/pub/taxonomy/

The URL which is currently in the package seems to be working on my end. I wonder if this was just a temporary issue at NCBI rather than a permanent change in the URL? Can you please check if the original URL works on your end now?

[KaiAragaki]

@stitam Thanks so much for your reply!

It looks like it works now - maybe there was a broken redirect that got fixed? Maybe I'm just dumb. Either way, I'll close this PR. Thank you!