Test julia vendored JuliaSyntax

[IanButterworth]

Given we want to use it for the julia CI coverage jobs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.06%. Comparing base (777708a) to head (2254fbf).
⚠️ Report is 1 commits behind head on master.

❌ Your project status has failed because the head coverage (96.06%) is below the target coverage (100.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #85   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files           4        4           
  Lines         356      356           
=======================================
  Hits          342      342           
  Misses         14       14           

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