build(deps): bump actions/download-artifact from 3 to 4 (#253)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/tests.yml

@@ -128,7 +128,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: error-pages-linux-amd64
           path: .artifact
@@ -188,7 +188,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     steps:
       - uses: actions/checkout@v4 # is needed for `upload-sarif` action
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: docker-image
           path: .artifact
@@ -214,7 +214,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: docker-image
           path: .artifact