Update to use feedgen v1.0.0 package

[douglatornell]

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (e5733ec) 77.73% compared to head (9572434) 77.73%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
nowcast/workers/make_plots.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #225   +/-   ##
=======================================
  Coverage   77.73%   77.73%           
=======================================
  Files         133      133           
  Lines       18722    18722           
  Branches     1912     1912           
=======================================
  Hits        14554    14554           
  Misses       4110     4110           
  Partials       58       58           

Flag	Coverage Δ
unittests	77.73% <87.50%> (ø)

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