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](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] <support@github.com>

Author: dependabot[bot]

.github/workflows/dotnet.yml

@@ -54,36 +54,36 @@ jobs:
         shell: powershell
         run: .\Scripts\post_build.ps1
       - name: Upload Plugin Nupkg
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: Plugin nupkg
           path: |
             Output\Release\Flow.Launcher.Plugin.*.nupkg
           compression-level: 0
       - name: Upload Setup
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: Flow Installer
           path: |
             Output\Packages\Flow-Launcher-*.exe
           compression-level: 0
       - name: Upload Portable Version
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: Portable Version
           path: |
             Output\Packages\Flow-Launcher-Portable.zip
           compression-level: 0
       - name: Upload Full Nupkg
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: Full nupkg
           path: |
             Output\Packages\FlowLauncher-*-full.nupkg
 
           compression-level: 0
       - name: Upload Release Information
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: RELEASES
           path: |