upgrade actions/upload-artifact to v4

Author: AlyaGomaa

.github/workflows/integration-tests.yml

@@ -87,7 +87,7 @@ jobs:
 
     - name: Upload Artifacts
       if: success() || failure()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: test_slips_locally-integration-tests-output
         path: |

.github/workflows/unit-tests.yml

@@ -125,7 +125,7 @@ jobs:
 
     - name: Upload Artifacts
       if: success() || failure()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: test_slips_locally-integration-tests-output
         path: |