github: Update codecov-action c-cpp.yml

Author: cejkato2

.github/workflows/c-cpp.yml

@@ -31,10 +31,11 @@ jobs:
       run: make check
     - name: make distcheck
       run: make distcheck
-    - uses: codecov/codecov-action@v1
+    - uses: codecov/codecov-action@v4
       with:
         flags: tests # optional
         name: nemea-framework # optional
         fail_ci_if_error: true # optional (default = false)
         verbose: true # optional (default = false)
+        token: ${{ secrets.CODECOV_TOKEN }} # required