The test with --pre dependencies is experimental

.github/workflows/step_tests-pip.yml

@@ -26,12 +26,12 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12"]
-        skip: [false]
+        experimental: [false]
         include:
           # Test pre-release versions
           - python-version: "3.x"
             dependency_type: "pre"
-            skip: true  # fails with pytest-8.0.0rc1
+            experimental: true  # fails with pytest-8.0.0rc1
           # Test minimum markdown-it-py supported (otherwise the most recent version is used)
           - python-version: "3.x"
             markdown-it-py: "~=2.0"
@@ -42,7 +42,6 @@ jobs:
           - python-version: "3.x"
             quarto: true
 
-    if: ${{ !matrix.skip }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -63,6 +62,7 @@ jobs:
       - name: Install a Jupyter Kernel
         if: ${{ !matrix.no_kernel }}
         run: python -m ipykernel install --name python_kernel --user
+
       - name: Uninstall markdown-it-py
         # Markdown-it-py is a dependency of Jupytext,
         # but Jupytext should still work if it is not installed
@@ -87,6 +87,7 @@ jobs:
           python -m jupyterlab.browser_check
 
       - name: Test with pytest
+        continue-on-error: experimental
         run: pytest -n logical --cov --cov-report=xml
 
       - name: Upload coverage