Update directory_writer.yml

Author: cclauss

.github/workflows/directory_writer.yml

@@ -12,6 +12,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: 3.14
+          allow-prereleases: true
       - name: Write DIRECTORY.md
         run: |
           scripts/build_directory_md.py 2>&1 | tee DIRECTORY.md