Update Next.js example favicon

[pacocoursey]

This updates the favicon from the outdated ZEIT logo to the new Vercel logo for the Next.js example.

Related Issues

vercel/next.js#26289

📋 Checklist

Tests

• The code changed/added as part of this PR has been covered with tests
• All tests pass locally with yarn test-unit

Code Review

• This PR has a concise title and thorough description useful to a reviewer
• Issue from task tracker has a link to this PR

[codecov]

Codecov Report

Merging #6367 (13a6797) into main (e659eec) will decrease coverage by 0.84%.
The diff coverage is n/a.

❗ Current head 13a6797 differs from pull request most recent head 004c0d4. Consider uploading reports for the commit 004c0d4 to get more accurate results

@@            Coverage Diff             @@
##             main    #6367      +/-   ##
==========================================
- Coverage   13.09%   12.24%   -0.85%     
==========================================
  Files         273      273              
  Lines        9935     9813     -122     
  Branches     1373     1434      +61     
==========================================
- Hits         1301     1202      -99     
+ Misses       8549     8517      -32     
- Partials       85       94       +9     

Impacted Files	Coverage Δ
src/util/dev/server.ts	49.00% <0.00%> (-3.94%)	⬇️
src/util/dev/builder-cache.ts	64.47% <0.00%> (-3.00%)	⬇️

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