chore(deps): update actions/checkout action to v6 (#98)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/python-package.yml

@@ -27,7 +27,7 @@ jobs:
           pymodbus-version: "2.5.3"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with: