Set 3.13 as experimental

Author: ezio-melotti

.github/workflows/test.yml

@@ -8,10 +8,15 @@ env:
 jobs:
   test:
     runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
     strategy:
       fail-fast: false
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        experimental: [false]
+        include:
+          - python-version: "3.13"
+            experimental: true
 
     steps:
       - uses: actions/checkout@v4
@@ -39,5 +44,3 @@ jobs:
           flags: ${{ matrix.python-version }}
           name: Python ${{ matrix.python-version }}
           token: ${{ secrets.CODECOV_ORG_TOKEN }}
-  
-    continue-on-error: ${{ matrix.python-version == '3.13' }}