Update LeakIX source to new API

[gboddin]

• New subdomain API
• API key is optionnal

[codecov[bot]]

Codecov Report

Merging #914 (7f9645b) into develop (89a83c6) will decrease coverage by 0.04%. The diff coverage is n/a.

:exclamation: Current head 7f9645b differs from pull request most recent head a5f9763. Consider uploading reports for the commit a5f9763 to get more accurate results

@@             Coverage Diff             @@
##           develop     #914      +/-   ##
===========================================
- Coverage    49.96%   49.91%   -0.04%     
===========================================
  Files           34       34              
  Lines         4052     4052              
===========================================
- Hits          2024     2022       -2     
- Misses        1931     1933       +2     
  Partials        97       97              

see 1 file with indirect coverage changes