Fix copying xcpp.data for xeus-cpp-lite deploy page

[anutosh491]

Description

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

Fixes https://github.com/compiler-research/xeus-cpp/actions/runs/12479062041/job/34827613787#step:7:272

Type of change

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• Bug fix
• New feature
• Added/removed dependencies
• Required documentation updates

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.72%. Comparing base (23913f6) to head (cbff0aa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #200   +/-   ##
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  Coverage   80.72%   80.72%           
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  Files          19       19           
  Lines         970      970           
  Branches       93       93           
=======================================
  Hits          783      783           
  Misses        187      187