GHA: Uprev codecov action to v5

Author: Flamefire

.github/workflows/ci.yml

@@ -1,6 +1,6 @@
 # Copyright 2020-2021 Peter Dimov
 # Copyright 2021 Andrey Semashev
-# Copyright 2021 Alexander Grund
+# Copyright 2021-2024 Alexander Grund
 # Copyright 2022 James E. King III
 #
 # Distributed under the Boost Software License, Version 1.0.
@@ -258,7 +258,7 @@ jobs:
 
       - name: Upload coverage
         if: matrix.coverage
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           disable_search: true
           file: coverage.info