Bump actions/upload-artifact from 5 to 6 (#38)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

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

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -47,13 +47,13 @@ jobs:
         working-directory: build
         run: cmake --build . --parallel --verbose
       - name: Upload Executable Artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: ${{ matrix.build-type == 'Release' && matrix.os-arch == 'Win64' }}
         with:
           name: "OpenXR-API-Layers-GUI-v${{steps.configure.outputs.version}}"
           path: build/out/bin
       - name: Upload Debug Symbol Artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: ${{ matrix.build-type == 'Release' && matrix.os-arch == 'Win64' }}
         with:
           name: "OpenXR-API-Layers-GUI-v${{steps.configure.outputs.version}}-DebugSymbols"