build(deps): bump actions/download-artifact from 2 to 4 (#462)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alan Jowett <alanjo@microsoft.com>

.github/workflows/fuzzing.yml

@@ -113,7 +113,7 @@ jobs:
         ref: fuzz/corpus
 
     - name: Download fuzzer artifacts
-      uses: actions/download-artifact@v2
+      uses: actions/download-artifact@v4
       with:
         name: fuzzer