Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -13,7 +13,7 @@ jobs:
       CIBW_TEST_COMMAND: python -c "from pyobjus import autoclass, objc_str"
       CIBW_TEST_SKIP: "*arm64*"
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v5

.github/workflows/python-package.yml

@@ -22,7 +22,7 @@ jobs:
           - "<3"
           - ">=3"
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up Python ${{ matrix.python }}
       uses: actions/setup-python@v5