CI: Update two more actions we depend on

actions/download-artifact@v4 -> actions/download-artifact@v8
docker/setup-qemu-action@v2 -> docker/setup-qemu-action@v4

Author: ruevs

.github/workflows/cd.yml

@@ -212,7 +212,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Download All Workflow Artifacts
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v8
 
     - name: Create release
       uses: softprops/action-gh-release@v2

.github/workflows/python.yml

@@ -121,7 +121,7 @@ jobs:
           fi
           sed -i.bak "s/^version = .*/version = \"${version}\"/g" pyproject.toml && rm pyproject.toml.bak
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v4
         if: matrix.architecture == 'aarch64'
         with:
           platforms: arm64
@@ -150,7 +150,7 @@ jobs:
     ]
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v8
         with:
           path: prebuilds
       - name: prepare

.github/workflows/wasmlib.yml

@@ -39,7 +39,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - run: git submodule update --init extlib/mimalloc extlib/eigen
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v8
         with:
           path: artifacts
       - name: Setup Node