chore(deps): bump actions/checkout from 4 to 6

.github/workflows/documentation.yml

@@ -11,7 +11,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
       - name: Install distclassipy
         run: |

.github/workflows/linter.yml

@@ -6,7 +6,7 @@ jobs:
   blackflakedoc:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: psf/black@stable
       with:
         options: "--check --verbose"

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

@@ -22,7 +22,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v5
       with:

.github/workflows/testing-and-coverage.yml

@@ -23,7 +23,7 @@ jobs:
     # Next we need to checkout out repository, and set up Python
     # A 'name' is just an optional label shown in the log - helpful to clarify progress - and can be anything
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5