Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -7,7 +7,7 @@ jobs:
     name: Build Distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Get history and tags for SCM versioning to work
         if: ${{ !startsWith(github.ref, 'refs/tags/') }}
         run: |

.github/workflows/docs.yml

@@ -20,7 +20,7 @@ jobs:
           - torch-version: 2.0.1
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build using Python ${{matrix.python-version}}
         uses: actions/setup-python@v5
         with:

.github/workflows/lint.yml

@@ -14,5 +14,5 @@ jobs:
   ruff:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: astral-sh/ruff-action@v3

.github/workflows/test_codebase.yml

@@ -33,7 +33,7 @@ jobs:
           - torch-version: 2.0.1
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:

.github/workflows/test_tutorials.yml

@@ -38,7 +38,7 @@ jobs:
         test-group: [1, 2, 3, 4]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
@@ -74,7 +74,7 @@ jobs:
         test-group: [1, 2, 3]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
@@ -109,7 +109,7 @@ jobs:
           - torch-version: 2.0.1
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
@@ -144,7 +144,7 @@ jobs:
           - torch-version: 2.0.1
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with: