fetchSDA_spatial(..., geom.src = "mlrapolygon") URL no longer working

[brownag]

It appears the path being used to fetch MLRA boundaries in fetchSDA_spatial(..., geom.src = "mlrapolygon") has stopped working.

"/vsizip//vsicurl/https://www.nrcs.usda.gov/sites/default/files/2022-10/MLRA_52_2022.zip/MLRA_52_2022"

As far as I can tell, this is an issue with the server configuration. I have observed the same behavior on the work and personal network/machines.

Uploading the same file to github, and using below URL, works fine as a replacement, so it does not seem to be a GDAL issue:
"/vsizip//vsicurl/https://github.com/brownag/bookish-guide/raw/refs/heads/main/MLRA_52_2022.zip/MLRA_52_2022"

I will probably add this ZIP file to soilDBdata and change the data source path for the time being.

Alternately I could make use of the user local cache directory for downloads (#377)