Bump actions/checkout from 5 to 6 (#1059)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/merge-pytest.yml

@@ -16,7 +16,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Setup conda
       uses: s-weigand/setup-conda@v1
       with:
@@ -46,7 +46,7 @@ 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
         id: setup-python
@@ -77,7 +77,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 2
     - name: Set up Python ${{ matrix.python-version }}
@@ -111,7 +111,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 2
     - name: Set up Python ${{ matrix.python-version }}

.github/workflows/merge-typing.yml

@@ -15,7 +15,7 @@ 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
       id: setup-python

.github/workflows/pr-pytest-apps.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: ['3.10']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 2
     - name: Set up Python ${{ matrix.python-version }}
@@ -43,7 +43,7 @@ jobs:
         python-version: ['3.10']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 2
     - name: Set up Python ${{ matrix.python-version }}

.github/workflows/pr-pytest.yml

@@ -16,7 +16,7 @@ jobs:
         python-version: ['3.10']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Setup conda
       uses: s-weigand/setup-conda@v1
       with:
@@ -49,7 +49,7 @@ 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
         id: setup-python
@@ -80,7 +80,7 @@ jobs:
         python-version: ['3.10']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 2
     - name: Set up Python ${{ matrix.python-version }}
@@ -112,7 +112,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 2
     - name: Set up Python ${{ matrix.python-version }}

.github/workflows/pr-type-lint-format.yml

@@ -15,7 +15,7 @@ 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
       id: setup-python

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

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6