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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