Add Python 3.14 preview (#2390)

* feat: add CPython 3.14 beta 1

* fix tests

cibuildwheel/resources/constraints-pyodide312.txt

@@ -19,7 +19,7 @@ charset-normalizer==3.4.2
     # via requests
 click==8.1.8
     # via typer
-cmake==4.0.0
+cmake==4.0.2
     # via pyodide-build
 distlib==0.3.9
     # via virtualenv
@@ -50,7 +50,7 @@ packaging==25.0
     #   unearth
 pip==25.1.1
     # via -r .nox/update_constraints/tmp/constraints-pyodide.in
-platformdirs==4.3.7
+platformdirs==4.3.8
     # via virtualenv
 pydantic==2.11.4
     # via
@@ -105,7 +105,7 @@ unearth==0.17.5
     # via pyodide-build
 urllib3==2.4.0
     # via requests
-virtualenv==20.30.0
+virtualenv==20.31.2
     # via
     #   build
     #   pyodide-build