fix: better s3source for pmtiles

[Kanahiro]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 12.82051% with 34 lines in your changes missing coverage. Please review.

Project coverage is 58.76%. Comparing base (83cc6f7) to head (8bd5e9b).
Report is 5 commits behind head on main.

Files	Patch %	Lines
src/source/pmtiles.ts	12.82%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   59.49%   58.76%   -0.74%     
==========================================
  Files          19       19              
  Lines        1459     1484      +25     
  Branches       92       92              
==========================================
+ Hits          868      872       +4     
- Misses        588      609      +21     
  Partials        3        3              

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