Bump actions/checkout from 5 to 6

.github/workflows/asv-main.yml

@@ -30,7 +30,7 @@ jobs:
       with:
         python-version: ${{env.PYTHON_VERSION}}
     - name: Checkout main branch of the repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: Install dependencies

.github/workflows/asv-nightly.yml

@@ -26,7 +26,7 @@ jobs:
       with:
         python-version: ${{env.PYTHON_VERSION}}
     - name: Checkout main branch of the repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: Install dependencies

.github/workflows/asv-pr.yml

@@ -32,7 +32,7 @@ jobs:
       with:
         python-version: ${{env.PYTHON_VERSION}}
     - name: Checkout PR branch of the repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: Display Workflow Run Information

.github/workflows/build-documentation.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python 3.11
       uses: actions/setup-python@v6
       with:

.github/workflows/pre-commit-ci.yml

@@ -14,7 +14,7 @@ jobs:
   pre-commit-ci:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0 
     - name: Set up Python

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

@@ -23,7 +23,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v6
       with:

.github/workflows/smoke-test.yml

@@ -23,7 +23,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:

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

@@ -19,7 +19,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:
@@ -41,7 +41,7 @@ jobs:
   test-lowest-versions:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python 3.10
       uses: actions/setup-python@v6
       with:

.github/workflows/testing-windows.yml

@@ -19,7 +19,7 @@ jobs:
         python-version: ['3.10']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:

src/nested_pandas/series/dtype.py

@@ -66,7 +66,7 @@ class NestedDtype(ExtensionDtype):
     """Attributes to use as metadata for __eq__ and __hash__"""
 
     @property
-    def na_value(self) -> Type[pd.NA]:  # type: ignore[valid-type]
+    def na_value(self):
         """The missing value for this dtype"""
         return pd.NA  # type: ignore[return-value]