ci: change codecov GHA version to v3 (#259)

change codecov GHA version to v3

Signed-off-by: gruebel <[email protected]>

Author: gruebel

.github/workflows/build.yml

@@ -46,7 +46,7 @@ jobs:
           behave tests/features/
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@c9e0f0b3cf5f112462339d69850c01735114b9ed
+        uses: codecov/codecov-action@v3
         with:
           flags: unittests # optional
           name: coverage # optional