Revert "Merge pull request #8335 from codeigniter4/dependabot/github_actions/actions/download-artifact-4"

This reverts commit 9179347, reversing
changes made to 3c75ca5.

Author: kenjis

.github/workflows/reusable-coveralls.yml

@@ -24,7 +24,7 @@ jobs:
           coverage: xdebug
 
       - name: Download coverage files
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           path: build/cov