Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows (#339)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

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

.github/workflows/main.yml

@@ -88,13 +88,13 @@ jobs:
       - build-jdk8
     steps:
       - name: retrieve generated war files (jre8)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: war-jre8
           path: artifacts
 
       - name: retrieve generated war files (jre11)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: war-jre11
           path: artifacts

.github/workflows/tests.yml

@@ -47,7 +47,7 @@ jobs:
           fetch-depth: 0
 
       - name: retrieve generated files (jre8)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: war-jre8
           path: artifacts