build: test nightly 3.13 nogil also

.github/workflows/python-nightly.yml

@@ -31,7 +31,7 @@ concurrency:
 
 jobs:
   tests:
-    name: "${{ matrix.python-version }}"
+    name: "${{ matrix.python-version }}, nogil ${{ matrix.nogil }}"
     # Choose a recent Ubuntu that deadsnakes still builds all the versions for.
     # For example, deadsnakes doesn't provide 3.10 nightly for 22.04 (jammy)
     # because jammy ships 3.10, and deadsnakes doesn't want to clobber it.
@@ -56,6 +56,11 @@ jobs:
           - "pypy-3.8-nightly"
           - "pypy-3.9-nightly"
           - "pypy-3.10-nightly"
+        nogil:
+          - false
+        include:
+          - python-version: "3.13-dev"
+            nogil: true
       fail-fast: false
 
     steps:
@@ -67,6 +72,7 @@ jobs:
         if: "!startsWith(matrix.python-version, 'pypy-')"
         with:
           python-version: "${{ matrix.python-version }}"
+          nogil: "${{ matrix.nogil }}"
 
       - name: "Install ${{ matrix.python-version }} with setup-python"
         uses: "actions/setup-python@v5"