Update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -90,7 +90,7 @@ jobs:
 
       # Store already-built plugin as an artifact for downloading
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ steps.artifact.outputs.filename }}
           path: ./build/distributions/content/*/*
@@ -126,7 +126,7 @@ jobs:
       # Collect Tests Result of failed tests
       - name: Collect Tests Result
         if: ${{ failure() }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: tests-result
           path: ${{ github.workspace }}/build/reports/tests
@@ -182,7 +182,7 @@ jobs:
       # Collect Plugin Verifier Result
       - name: Collect Plugin Verifier Result
         if: ${{ always() }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: pluginVerifier-result
           path: ${{ github.workspace }}/build/reports/pluginVerifier