build(deps): Bump actions/download-artifact from 3 to 4 (cosmos#5426)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@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/test.yml

@@ -95,7 +95,7 @@ jobs:
             **/**.go
             go.mod
             go.sum
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: '${{ github.sha }}-${{ matrix.part }}'
         if: env.GIT_DIFF
@@ -119,19 +119,19 @@ jobs:
             **/**.go
             go.mod
             go.sum
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: '${{ github.sha }}-00-coverage'
         if: env.GIT_DIFF
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: '${{ github.sha }}-01-coverage'
         if: env.GIT_DIFF
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: '${{ github.sha }}-02-coverage'
         if: env.GIT_DIFF
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: '${{ github.sha }}-03-coverage'
         if: env.GIT_DIFF