Upgrade default Python version to 3.12

Signed-off-by: tdruez <tdruez@nexb.com>

Author: tdruez

README.md

@@ -79,7 +79,7 @@ steps:
     compliance-fail-level:
 
     # Python version that will be installed to run ScanCode.io
-    # Default is '3.11'
+    # Default is '3.12'
     python-version:
 ```
 

action.yml

@@ -30,7 +30,7 @@ inputs:
     required: false
   python-version:
     description: "Python version."
-    default: "3.11"
+    default: "3.12"
   scancodeio-repo-branch:
     description: "Branch to install ScanCode.io from the GitHub repository (optional)"
     required: false