Update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Build
       run: cargo build --release
     - name: Upload build artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v6
       with:
         name: build-artifacts
         path: |