chore: add google-auth for new example dashboard

[betodealmeida]

SUMMARY

Add the google-auth (via shillelagh[gsheetsapi]) so that we can have Evan's fancy dashboard (#26442) as an example in new Superset installs.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[rusackas]

LGTM! Thanks for adding!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f084572) 67.22% compared to head (fbf339c) 67.22%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #26816      +/-   ##
==========================================
- Coverage   67.22%   67.22%   -0.01%     
==========================================
  Files        1894     1894              
  Lines       74192    74192              
  Branches     8244     8244              
==========================================
- Hits        49878    49877       -1     
- Misses      22242    22243       +1     
  Partials     2072     2072              

Flag	Coverage Δ
mysql	77.96% <ø> (+0.02%)	⬆️
postgres	78.06% <ø> (ø)
python	78.19% <ø> (-0.01%)	⬇️
sqlite	77.64% <ø> (ø)

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