chore(deps): update actions/checkout action to v4 (#514)

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

Author: renovate[bot]

.github/workflows/auto-testing.yml

@@ -13,7 +13,7 @@ jobs:
         python-version: [ '3.8', '3.9', '3.10', '3.11']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
     - name: Set up Python ${{ matrix.python-version }}

.github/workflows/bump-minor-version.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Setup
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: recursive
       - name: Update submodules

.github/workflows/publish-to-pypi.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
     - name: Set up Python