Bump actions/upload-artifact from 5 to 6 (#902)

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

@@ -104,28 +104,28 @@ jobs:
           make appimage
 
       - name: Upload Windows zip Package
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: runner.os == 'Windows'
         with:
           name: NotepadNext-Windows-Qt${{ matrix.qt_version }}-Zip
           path: ${{ github.workspace }}/build/package/
 
       - name: Upload Windows Installer
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: runner.os == 'Windows'
         with:
           name: NotepadNext-Windows-Qt${{ matrix.qt_version }}-Installer
           path: ${{ github.workspace }}/installer/NotepadNext*.exe
 
       - name: Upload macOS dmg
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: runner.os == 'macOS'
         with:
           name: NotepadNext-macOS-Qt${{ matrix.qt_version }}
           path: ${{ github.workspace }}/build/NotepadNext/NotepadNext*.dmg
 
       - name: Upload Linux AppImage
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: runner.os == 'Linux'
         with:
           name: NotepadNext-Linux-Qt${{ matrix.qt_version }}-AppImage