Update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/pr-build.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Build
         run: ./gradlew build
       - name: Upload Unsigned Module
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ignition-extensions-unsigned
           path: build/Ignition-Extensions.unsigned.modl