TEMP: Use Python 3.13.0-rc.3 for GHA

Author: amotl

.github/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'macos-latest']
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13.0-rc.3']
         cratedb-version: ['5.8.3']
 
         # To save resources, only verify the most recent Python versions on macOS.