gha: update codecov/codecov-action@v4

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

.github/workflows/test.yml

@@ -44,6 +44,6 @@ jobs:
         make coverage
 
     - name: Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         directory: ./