github: allow Python prereleases

This allows us to test Python releases prior to the final release. It
shouldn't hurt adding this.

Signed-off-by: Bastian Krause <[email protected]>

Author: Bastian-Krause

.github/workflows/reusable-unit-tests.yml

@@ -25,6 +25,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ inputs.python-version }}
+        allow-prereleases: true
     - uses: actions/cache@v4
       with:
         path: ~/.cache/pip