ci(github-actions): use 3.13 instead of 3.13-dev as Python 3.13 has already been released

Author: Lee-W

.github/workflows/pythonpackage.yml

@@ -6,7 +6,7 @@ jobs:
   python-check:
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         platform: [ubuntu-20.04, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps: