Bump actions/upload-artifact from 5 to 6

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

.github/workflows/desktop-build.yml

@@ -213,7 +213,7 @@ jobs:
       - name: Upload artifact
         id: upload_artifact
         if: matrix.package != 'skip'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{matrix.distro}}${{matrix.version}}-package
           path: ${{steps.build.outputs.path}}
@@ -450,7 +450,7 @@ jobs:
       - name: Upload artifact
         id: upload_artifact
         if: matrix.make_package
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{matrix.artifact_name}}
           path: ${{steps.build.outputs.path}}
@@ -458,7 +458,7 @@ jobs:
 
       - name: Upload pdb database
         if: matrix.os == 'Windows'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: Windows${{matrix.target}}-debug-pdbs
           path: |