Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows

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](actions/download-artifact@v3...v4.1.7)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/unittests_linux.yml

@@ -67,7 +67,7 @@ jobs:
 
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           path: artifacts
 

.github/workflows/unittests_macos.yml

@@ -52,7 +52,7 @@ jobs:
 
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           path: artifacts
 

.github/workflows/unittests_windows.yml

@@ -68,7 +68,7 @@ jobs:
 
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           path: artifacts