Bump actions/upload-artifact from 5.0.0 to 6.0.0 (#481)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -57,7 +57,7 @@ jobs:
       - name:  Copy release files for upload
         run: Copy-Item -Path dnSpy\dnSpy\bin\Release\${{matrix.build-dir}}\* -Destination C:\builtfiles\dnSpy-${{matrix.platform}} -Recurse
 
-      - uses: actions/upload-artifact@v5.0.0
+      - uses: actions/upload-artifact@v6.0.0
         if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/')
         with:
           name: dnSpy-${{matrix.package-name}}