Fix coverage upload

[hugovk]

• I'm acknowledging that my submission is free of all known copyright in at least
  the United States. (In general, works of the federal government should satisfy
  this criteria.)

Also https://github.com/unitedstates/congress-legislators now uses main, and add some more f-strings.

[codecov-commenter]

Codecov Report

Merging #214 (3e04486) into gh-pages (ba7776f) will not change coverage.
The diff coverage is 50.00%.

@@            Coverage Diff            @@
##           gh-pages     #214   +/-   ##
=========================================
  Coverage     57.42%   57.42%           
=========================================
  Files             2        2           
  Lines           101      101           
=========================================
  Hits             58       58           
  Misses           43       43           

Impacted Files	Coverage Δ
scripts/missing.py	100.00% <ø> (ø)
scripts/gpo_member_photos.py	46.25% <50.00%> (ø)

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