Update example in _index.md to use Bucket V2

[mjeffryes]

This is probably one of our more visible examples so it should point to our recommended resource

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.46%. Comparing base (235ddc7) to head (90bda0e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5098   +/-   ##
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  Coverage   24.46%   24.46%           
=======================================
  Files         361      361           
  Lines      144037   144037           
=======================================
  Hits        35243    35243           
  Misses     108696   108696           
  Partials       98       98           

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