Setup Dependabot for Github actions, bump checkout and setup-python actions

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: monthly
+    groups:
+      actions:
+        patterns:
+          - "*"

.github/workflows/build.yml

@@ -12,8 +12,8 @@ jobs:
         tox-job: [doc, pep8]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.x
       - run: pip install tox
@@ -44,9 +44,9 @@ jobs:
             build: 'free-threading'
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         if: ${{ matrix.build != 'free-threading' }}
         with:
           python-version: ${{ matrix.python }}

.github/workflows/publish.yml

@@ -13,9 +13,9 @@ jobs:
       id-token: write
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
         cache: pip