[MRG] Update circleci config version

[rflamary]

Types of changes

Motivation and context / Related issue

How has this been tested (if it applies)

PR checklist

• I have read the CONTRIBUTING document.
• The documentation is up-to-date with the changes I made (check build artifacts).
• All tests passed, and additional code has been covered with new tests.
• I have added the PR and Issue fix to the RELEASES.md file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.86%. Comparing base (98d09a1) to head (e66844a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #882   +/-   ##
=======================================
  Coverage   96.86%   96.86%           
=======================================
  Files         128      128           
  Lines       26304    26304           
=======================================
  Hits        25480    25480           
  Misses        824      824           

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