github-actions: increase version of codecov-action

Author: cejkato2

.github/workflows/c-cpp.yml

@@ -35,7 +35,7 @@ jobs:
       run: ./configure --with-raw --with-pcap --with-nemea --with-gtest --enable-debug CXXFLAGS=-coverage CFLAGS=-coverage LDFLAGS=-lgcov
     - name: rebuild and check
       run: make clean; make check
-    - uses: codecov/codecov-action@v3
+    - uses: codecov/codecov-action@v4
       with:
         flags: tests # optional
         name: ipfixprobe # optional