Fix deploy-pages.yml

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

This PR should fix the workflow which deploys our Github page xeus-cpp example. These issues didn't show until it was attempted to run on the main.

Fixes # (issue)

Type of change

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• Bug fix
• New feature
• Requires documentation updates

Testing

Please describe the test(s) that you added and ran to verify your changes.

Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.15%. Comparing base (b9c4822) to head (d131578).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #382   +/-   ##
=======================================
  Coverage   76.15%   76.15%           
=======================================
  Files           8        8           
  Lines        3137     3137           
=======================================
  Hits         2389     2389           
  Misses        748      748