Update dependency pyodide/pyodide to v0.29.3 (#17)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements.txt

@@ -1,3 +1,3 @@
 pyodide-build==0.32.0
 # TODO: Auto-update latest stable from https://raw.githubusercontent.com/pyodide/pyodide/refs/heads/main/pyodide-cross-build-environments.json
-# pyodide-xbuildenv==0.29.0 # See main.yml
+# pyodide-xbuildenv==0.29.3 # See main.yml