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](https://github.com/actions/checkout/compare/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>

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
       run:
         shell: bash
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5

.github/workflows/jit.yml

@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 90
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Build tier two interpreter
@@ -88,7 +88,7 @@ jobs:
             architecture: aarch64
             runner: ubuntu-24.04-arm
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5
@@ -138,7 +138,7 @@ jobs:
   #       llvm:
   #         - 19
   #   steps:
-  #     - uses: actions/checkout@v5
+  #     - uses: actions/checkout@v6
   #       with:
   #         persist-credentials: false
   #     - uses: actions/setup-python@v5

.github/workflows/lint.yml

@@ -19,7 +19,7 @@ jobs:
     timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5

.github/workflows/mypy.yml

@@ -60,7 +60,7 @@ jobs:
           "Tools/wasm",
         ]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5

.github/workflows/reusable-context.yml

@@ -57,7 +57,7 @@ jobs:
     - run: >-
         echo '${{ github.event_name }}'
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
         ref: >-

.github/workflows/reusable-docs.yml

@@ -27,7 +27,7 @@ jobs:
       refspec_pr: '+${{ github.event.pull_request.head.sha }}:remotes/origin/${{ github.event.pull_request.head.ref }}'
     steps:
     - name: 'Check out latest PR branch commit'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false
         ref: >-
@@ -82,7 +82,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - uses: actions/cache@v4

.github/workflows/reusable-macos.yml

@@ -31,7 +31,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       TERM: linux
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Runner image version

.github/workflows/reusable-san.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Runner image version

.github/workflows/reusable-ubuntu.yml

@@ -34,7 +34,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       TERM: linux
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Register gcc problem matcher

.github/workflows/reusable-wasi.yml

@@ -22,7 +22,7 @@ jobs:
       CROSS_BUILD_PYTHON: cross-build/build
       CROSS_BUILD_WASI: cross-build/wasm32-wasip1
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     # No problem resolver registered as one doesn't currently exist for Clang.

.github/workflows/reusable-windows-msi.yml

@@ -23,7 +23,7 @@ jobs:
       ARCH: ${{ inputs.arch }}
       IncludeFreethreaded: true
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Build CPython installer

.github/workflows/reusable-windows.yml

@@ -26,7 +26,7 @@ jobs:
     env:
       ARCH: ${{ inputs.arch }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Register MSVC problem matcher

.github/workflows/tail-call.yml

@@ -72,7 +72,7 @@ jobs:
             architecture: x86_64
             runner: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5

.github/workflows/verify-ensurepip-wheels.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5