Bump actions/checkout from 3 to 4 (#3914)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/dependabot-prs.yml

@@ -18,7 +18,7 @@ jobs:
       id: dependabot-metadata
       uses: dependabot/fetch-metadata@v1.6.0
 
-    - uses: actions/checkout@v3.5.2
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.event.pull_request.head.ref }}
 

.github/workflows/docs-linkcheck.yml

@@ -14,7 +14,7 @@ jobs:
         os: [ubuntu-latest]
       fail-fast: False
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
         os: [ubuntu-latest]
       fail-fast: False
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:

.github/workflows/type_completeness.yml

@@ -12,7 +12,7 @@ jobs:
     name:   test-type-completeness
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: git fetch --depth=1  # https://github.com/actions/checkout/issues/329#issuecomment-674881489
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4

.github/workflows/unit_tests.yml

@@ -20,7 +20,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
       fail-fast: False
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with: