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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci-cd.yml

@@ -36,7 +36,7 @@ jobs:
     timeout-minutes: 5
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: >-
@@ -105,7 +105,7 @@ jobs:
     timeout-minutes: 5
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: Cache llhttp generated files
@@ -161,7 +161,7 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: Setup Python ${{ matrix.pyver }}
@@ -265,7 +265,7 @@ jobs:
     timeout-minutes: 12
     steps:
     - name: Checkout project
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: Setup Python 3.13.2
@@ -334,7 +334,7 @@ jobs:
     needs: pre-deploy
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: Setup Python
@@ -407,7 +407,7 @@ jobs:
           musl: musllinux
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: Set up QEMU
@@ -478,7 +478,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: Login

.github/workflows/codeql.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v4

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

@@ -8,7 +8,7 @@ jobs:
     if: github.repository_owner == 'aiohttp'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v6
       with: