test: Make test application scalable

also fixes github CI and makes the linger stress test run multiple times

.github/workflows/ci-linux.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Install deps
       run: |
         sudo apt-get install check ninja-build doxygen
@@ -41,7 +41,7 @@ jobs:
 
     - name: Upload Test Results
       if: always()
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: Test Results ${{ matrix.compiler }}
         path: "*.xml"
@@ -55,7 +55,7 @@ jobs:
     if: always()
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           path: artifacts