Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/openlane_ci.yml

@@ -133,7 +133,7 @@ jobs:
         uses: ./.github/actions/set_env_variables
 
       - name: Download Docker Image
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: docker-image-amd64
           path: /tmp
@@ -142,7 +142,7 @@ jobs:
         run: docker load --input /tmp/image-amd64.tar
 
       - name: Download PDK Tarball
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: pdk-tarball-sky130A
           path: /tmp
@@ -185,7 +185,7 @@ jobs:
         uses: ./.github/actions/set_env_variables
 
       - name: Download Docker Image (amd64)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: docker-image-amd64
           path: /tmp
@@ -194,7 +194,7 @@ jobs:
         run: docker load --input /tmp/image-amd64.tar
 
       - name: Download PDK Tarball
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: pdk-tarball-${{ matrix.design.pdk }}
           path: /tmp
@@ -268,13 +268,13 @@ jobs:
         uses: ./.github/actions/set_env_variables
 
       - name: Download Docker Image (amd64)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: docker-image-amd64
           path: /tmp
 
       - name: Download Docker Image (arm64v8)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: docker-image-arm64v8
           path: /tmp