Python version in nighly exclude should be string

Author: ToveRumar

.github/workflows/nightly.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: ["3.10", "3.11", "3.12", "3.13"]
         exclude:
           - os: lab-mac
-            python-version: ["3.13"]
+            python-version: "3.13"
 
     runs-on: ${{ matrix.os }}