fix: normalize CRLF, LF, and CR line endings in JSX literal cleaning function

[JstUsername]

This PR addresses the line-ending inconsistency issue described in js-lingu#2304, improving cross-platform support for JSX literal child processing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.44%. Comparing base (49a9dc7) to head (6b40abc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #165   +/-   ##
=======================================
  Coverage   92.44%   92.44%           
=======================================
  Files           8        8           
  Lines        1364     1364           
=======================================
  Hits         1261     1261           
  Misses        103      103           

Flag	Coverage Δ
unittests	92.44% <100.00%> (ø)

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Files with missing lines	Coverage Δ
src/jsx_visitor.rs	88.76% <100.00%> (ø)

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