ci: bump the ga-dependencies group across 1 directory with 2 updates

Bumps the ga-dependencies group with 2 updates in the / directory: [actions/checkout](https://github.com/actions/checkout) and [actions/upload-artifact](https://github.com/actions/upload-artifact).


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)

Updates `actions/upload-artifact` from 4 to 5
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ga-dependencies
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ga-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/c-cpp.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Check environment
       run: |
         cat /proc/cpuinfo
@@ -52,17 +52,17 @@ jobs:
           cd ..
         done
     - name: Upload cpp tests
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: tests-cpp-lin
         path: tests-cpp
     - name: Upload sycl tests
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: tests-sycl-lin
         path: tests-sycl
     - name: Upload ispc tests
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: tests-ispc-lin
         path: tests-ispc
@@ -71,7 +71,7 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Check environment
       run: |
         sysctl -n machdep.cpu.brand_string
@@ -114,17 +114,17 @@ jobs:
           cd ..
         done
     - name: Upload cpp tests
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: tests-cpp-mac
         path: tests-cpp
     - name: Upload sycl tests
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: tests-sycl-mac
         path: tests-sycl
     - name: Upload ispc tests
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: tests-ispc-mac
         path: tests-ispc
@@ -133,7 +133,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Check environment
       shell: cmd
       run: |