Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
         working-directory: build
         run: cmake --build . --parallel --verbose
       - name: Upload Executable Artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         if: ${{ matrix.preset == 'Release' }}
         with:
           name: "intermediate-${{matrix.arch}}"
@@ -75,12 +75,12 @@ jobs:
             rsync -av "$dir/" staging/
           done
       - name: Upload binaries
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: "OpenXR-API-Layers-GUI-v${{needs.build.outputs.version}}"
           path: staging/bin
       - name: Upload debug symbols
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: "OpenXR-API-Layers-GUI-DebugSymbols-v${{needs.build.outputs.version}}"
           path: staging/pdb