build(deps): bump actions/checkout from 5 to 6

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>

Author: dependabot[bot]

.github/workflows/build_wheels.yml

@@ -19,7 +19,7 @@ jobs:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Build sdist
         run: pipx run build --sdist
@@ -84,7 +84,7 @@ jobs:
       matrix:
         python_version: ["2.7", "3.7"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/download-artifact@v5
         with:
           name: "manylinux_x86_64-wheels"
@@ -124,7 +124,7 @@ jobs:
       matrix:
         python_version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
@@ -162,7 +162,7 @@ jobs:
       matrix:
         python_version: ["3.8", "3.13", "3.14"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
@@ -200,7 +200,7 @@ jobs:
       matrix:
         python_version: ["3.13", "3.14"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
@@ -246,7 +246,7 @@ jobs:
       options: --cap-add=SYS_PTRACE
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up dependencies
         run: |
           apk add --update alpine-sdk bash alpine-sdk python3 python3-dev gdb musl-dbg python3-dbg
@@ -276,7 +276,7 @@ jobs:
       options: --cap-add=SYS_PTRACE
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up dependencies
         run: |
           dnf install -y \
@@ -311,7 +311,7 @@ jobs:
       image: archlinux
       options: --cap-add=SYS_PTRACE --security-opt seccomp=unconfined
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up dependencies
         run: |
           pacman -Syu --noconfirm \
@@ -351,7 +351,7 @@ jobs:
       options: --cap-add=SYS_PTRACE
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up dependencies
         run: |
           apt-get update

.github/workflows/coverage.yml

@@ -27,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:

.github/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:

.github/workflows/lint_and_docs.yml

@@ -6,7 +6,7 @@ jobs:
   lint_and_docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: "3.10"