Write to `tempdir()` as requested by cran

[codecov[bot]]

Codecov Report

Merging #189 (cab3298) into main (2e14f29) will decrease coverage by 0.21%. The diff coverage is n/a.

:exclamation: Current head cab3298 differs from pull request most recent head f447cc6. Consider uploading reports for the commit f447cc6 to get more accurate results

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
- Coverage   82.68%   82.47%   -0.22%     
==========================================
  Files          96       96              
  Lines        2339     2339              
==========================================
- Hits         1934     1929       -5     
- Misses        405      410       +5     

Impacted Files	Coverage Δ
R/create_config.R	81.25% <ø> (ø)
R/download_from_url.R	0.00% <0.00%> (-100.00%)	:arrow_down:
R/finalise.R	96.87% <0.00%> (+0.44%)	:arrow_up:
R/initialise.R	82.80% <0.00%> (+0.63%)	:arrow_up:
R/resolve_read.R	80.30% <0.00%> (+1.51%)	:arrow_up:

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