chore(deps): 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/artifact.yml

@@ -22,29 +22,29 @@ jobs:
     - name: Build with Maven
       run: mvn -B clean verify -ntp -DskipTests -Poffline
     - name: Archive windows product
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: rcp.product-win32.win32.x86_64
         path: sites/com.tlcsdm.eclipse.rcp.example.rcp.product/target/products/*win32*.zip
     - name: Archive macos product
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: rcp.product-macosx.cocoa.aarch64
         path: sites/com.tlcsdm.eclipse.rcp.example.rcp.product/target/products/*macos*.tar.gz
     - name: Archive linux product
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: rcp.product-linux.gtk.x86_64
         path: sites/com.tlcsdm.eclipse.rcp.example.rcp.product/target/products/*linux*.tar.gz
 
     - name: Archive update windows product
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: update.product-win32.win32.x86_64
         path: sites/com.tlcsdm.eclipse.rcp.example.update.product/target/products/*win32*.zip
 
     - name: Archive headless windows product
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: headless.product-win32.win32.x86_64
         path: sites/com.tlcsdm.eclipse.rcp.example.headless.product/target/products/*win32*.zip