Update GitHub CI

Author: colemancda

.github/workflows/buildroot.yml

@@ -18,17 +18,17 @@ jobs:
             $SWIFT_BUILDROOT/.devcontainer/build-scripts/download-buildroot.sh
             $SWIFT_BUILDROOT/.devcontainer/build-scripts/build.sh
         - name: Archive Build artifacts
-          uses: actions/upload-artifact@v3
+          uses: actions/upload-artifact@v4.5.0
           with:
             name: build-${{ matrix.arch }}
-            path: ./output/${{ matrix.arch }}/images
+            path: ${{ github.workspace }}/output/${{ matrix.arch }}/images/rootfs.tar
         - name: Test
           run: |
               export SWIFT_BUILDROOT=$GITHUB_WORKSPACE
               export SWIFT_TARGET_ARCH=${{ matrix.arch }}
               $SWIFT_BUILDROOT/.devcontainer/build-scripts/test-swift.sh
         - name: Upload test binary
-          uses: actions/upload-artifact@v3
+          uses: actions/upload-artifact@v4.5.0
           with:
             name: swift-hello-${{ matrix.arch }}
-            path: ./output/${{ matrix.arch }}/target/usr/bin/swift-hello
+            path: ${{ github.workspace }}/output/${{ matrix.arch }}/target/usr/bin/swift-hello