swift 6.3 nightly

[swhitty]

Add linux swift 6.3 build using the nightly docker image

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.80%. Comparing base (30afbc2) to head (018c3bb).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   92.77%   92.80%   +0.02%     
==========================================
  Files          69       69              
  Lines        3446     3446              
==========================================
+ Hits         3197     3198       +1     
+ Misses        249      248       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.