Chg to use graham data transfer node

[douglatornell]

gra-dtn1.computecanada.ca (ssh aliased as graham-dtn) is optimized for data transfer in comparison to login nodes.

[codecov]

Codecov Report

Merging #87 (02e2e16) into main (15608c3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             main      #87    +/-   ##
========================================
  Coverage   72.91%   72.91%            
========================================
  Files         122      122            
  Lines       15982    15982            
  Branches      953     1099   +146     
========================================
  Hits        11653    11653            
  Misses       4279     4279            
  Partials       50       50            

Flag	Coverage Δ
unittests	72.91% <ø> (ø)

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Impacted Files	Coverage Δ
tests/test_next_workers.py	99.71% <ø> (ø)
tests/workers/test_download_results.py	100.00% <ø> (ø)
tests/workers/test_make_forcing_links.py	100.00% <ø> (ø)
tests/workers/test_split_results.py	100.00% <ø> (ø)
tests/workers/test_upload_forcing.py	98.87% <ø> (ø)

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[douglatornell]

Deployed branch on skkokum for testing and got successful runs of upload_forcing worker with graham-dtn as target host on 14-Dec-2021.