bump action versions

Author: esoteric-ephemera

.github/workflows/testing.yml

@@ -23,11 +23,11 @@ jobs:
         os: ["ubuntu-latest"]
         python-version: ["3.11", "3.12"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
           cache: "pip"