Bump actions/checkout from 5 to 6 in the github-actions group (KhronosGroup#557)

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/presubmit.yml

@@ -8,7 +8,7 @@ jobs:
   validate_json:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Validate
         run: python3 tools/check_grammar/check_grammar.py include/spirv/unified1/*.json
 
@@ -19,7 +19,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Ubuntu packages
         if: matrix.os == 'ubuntu-latest'
         run: sudo apt install -y dos2unix
@@ -59,7 +59,7 @@ jobs:
   test_cmake_min_required:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: 3.14.0
@@ -71,7 +71,7 @@ jobs:
   test_cmake_latest:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
       - name: CMake build
         run: |
@@ -81,7 +81,7 @@ jobs:
   add_subdirectory:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: 3.15.0
@@ -93,7 +93,7 @@ jobs:
   find_package:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: 3.15.0
@@ -109,7 +109,7 @@ jobs:
   find_pkg_config:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: 3.15.0
@@ -126,7 +126,7 @@ jobs:
   find_pkg_config_absolute:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: 3.15.0
@@ -148,6 +148,6 @@ jobs:
     container: khronosgroup/docker-images@sha256:724f67d8562445523644abf017d5d192b369fafc122de75e9d26792c649821a0
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: REUSE license checker
         run: reuse lint