ci: upgrade cibuildwheel 3.1.4 -> 4.1.0

They dropped support for the 3.13 free-threaded builds. So we did too.

Author: indygreg

.github/workflows/wheel.yml

@@ -20,7 +20,6 @@ jobs:
           - 'cp311'
           - 'cp312'
           - 'cp313'
-          - 'cp313t'
           - 'cp314'
           - 'cp314t'
         arch:
@@ -105,7 +104,7 @@ jobs:
 
       - name: Build wheels
         run: |
-          uvx -p 3.13 cibuildwheel@3.1.4
+          uvx -p 3.13 cibuildwheel@4.1.0
 
       - name: Upload Wheel
         if: ${{ !endsWith(matrix.py, 't') }}
@@ -123,7 +122,6 @@ jobs:
           - 'cp311'
           - 'cp312'
           - 'cp313'
-          - 'cp313t'
           - 'cp314'
           - 'cp314t'
         arch:
@@ -146,7 +144,7 @@ jobs:
 
       - name: Build wheels
         run: |
-          uvx -p 3.13 cibuildwheel@3.1.4
+          uvx -p 3.13 cibuildwheel@4.1.0
 
       - name: Upload Wheel
         if: ${{ !endsWith(matrix.py, 't') }}
@@ -164,7 +162,6 @@ jobs:
           - 'cp311'
           - 'cp312'
           - 'cp313'
-          - 'cp313t'
           - 'cp314'
           - 'cp314t'
         arch:
@@ -191,7 +188,7 @@ jobs:
 
       - name: Build wheels
         run: |
-          uvx -p 3.13 cibuildwheel@3.1.4
+          uvx -p 3.13 cibuildwheel@4.1.0
 
       - name: Upload Wheel
         if: ${{ !endsWith(matrix.py, 't') }}

docs/news.rst

@@ -14,6 +14,8 @@ Backwards Compatibility Notes
   Python 3.10 is the minimum supported Python version. The code should still be
   compatible with Python 3.10 and removing of version checks from ``setup.py``
   will likely yield a working install. However, this is not officially supported.
+* cibuildwheel upgrade required us to drop generating the CPython 3.13 free-threaded
+  wheels.
 
 0.25.0 (released 2025-09-14)
 ============================

pyproject.toml

@@ -61,7 +61,7 @@ line-length = 80
 select = ["E4", "E7", "E9", "F", "I"]
 
 [tool.cibuildwheel]
-enable = ["cpython-freethreading", "cpython-prerelease"]
+enable = ["cpython-prerelease"]
 build-frontend = "build[uv]"
 
 # Turn compiler warnings into errors.