switch API backend to use api.metacpan.org/v1

[haarg]

api.metacpan.org/v1 is now available and equivalent to fastapi.metacpan.org. api.metacpan.org/ without a versioned path is only a redirect and can't be used to access any API end points.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.45%. Comparing base (27d6ef4) to head (b9b5f8a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3348      +/-   ##
==========================================
- Coverage   73.53%   73.45%   -0.09%     
==========================================
  Files          68       68              
  Lines        2388     2388              
  Branches      335      335              
==========================================
- Hits         1756     1754       -2     
- Misses        507      508       +1     
- Partials      125      126       +1     

see 1 file with indirect coverage changes

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