Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4.1.7)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/rover.yaml

@@ -157,7 +157,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: true
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         name: Download docker images
         with:
           name: docker-images-skywalking-rover
@@ -245,17 +245,17 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: true
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         name: Download rover docker image
         with:
           name: docker-images-skywalking-rover
           path: docker-images
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         name: Download nginx docker image
         with:
           name: docker-images-test-nginx
           path: docker-images
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         name: Download SSL Data
         with:
           name: network-ssl-data
@@ -316,7 +316,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: true
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         name: Download docker images
         with:
           name: docker-images-skywalking-rover