build(deps): bump actions/download-artifact from 2 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/tests.yml

@@ -28,7 +28,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Get Docker Image
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: image
       - name: Load Docker Image
@@ -46,7 +46,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Get Docker Image
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: image
       - name: Load Docker Image
@@ -71,7 +71,7 @@ jobs:
           password: '${{ secrets.DOCKERHUB_TOKEN }}'
 
       - name: Get Docker Image
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: image