Update road download function

[mcuadera]

The rnaturalearth package may fail due to issues with the SSL certificate, especially when behind a firewall. This modifies the update_road_spatial_data() function to take a zip file downloaded from the Natural Earth website. To test:

1. Find and download the roads zip file here
2. Pass the local file_path to update_road_spatial_data(). Ensure the output path is in "GID/PEB/SIR/Sandbox/spatial/roads.new.rds".

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 2.01%. Comparing base (b94a303) to head (a5ccabe).

Files with missing lines	Patch %	Lines
R/update_spatial_data.R	0.00%	7 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           hotfix    #432   +/-   ##
======================================
  Coverage    2.01%   2.01%           
======================================
  Files          37      37           
  Lines       14984   14984           
======================================
  Hits          302     302           
  Misses      14682   14682           

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