fix(gpo_member_photos): regex was returning 0 results

[ryparker]

Summary

This PR fixes the script in scripts/gpo_member_photos.py. Before this PR 0 images would be found when scanning pages for image URLs.

This PR updates the image regex so that it searches the HTML for <a href="/member/[^/]+/(\w+)[^<]+</a></span>.

Old value: <a href="https://www.congress.gov/member/[^/]+/(\w+)[^<]+</a></span>

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  the United States. (In general, works of the federal government should satisfy
  this criteria.)

[codecov-commenter]

Codecov Report

Merging #212 (7bd2341) into gh-pages (76394d3) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           gh-pages     #212   +/-   ##
=========================================
  Coverage     57.42%   57.42%           
=========================================
  Files             2        2           
  Lines           101      101           
=========================================
  Hits             58       58           
  Misses           43       43           

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

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[hugovk]

Thank you!