Use final release of 3.13 (#1258)

This has been released now on Github.

Author: sliverc

Diff for: .github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       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"]
     env:
       PYTHON: ${{ matrix.python-version }}
     steps: