Update test runners to include 3.13

Author: schloerke

.github/workflows/pytest.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.12", "3.11", "3.10", "3.9"]
+        python-version: ["3.13", "3.12", "3.11", "3.10", "3.9"]
         os: [ubuntu-latest, windows-latest, macOS-latest]
       fail-fast: false
     defaults:

.github/workflows/shiny.yaml

@@ -22,7 +22,7 @@ jobs:
       - name: Setup py-shiny@main
         uses: posit-dev/py-shiny/.github/py-shiny/setup@main
         with:
-          python-version: "3.12"
+          python-version: "3.13"
 
       - name: Checkout dev branch of py-htmltools
         uses: actions/checkout@v4