Replace "apk add" by "apt install" in unit tests workflow

Author: apaillier-ledger

.github/workflows/unit_tests.yml

@@ -47,7 +47,7 @@ jobs:
           path: unit-tests/coverage
 
       - name: Install codecov dependencies
-        run: apk update && apk add curl gpg
+        run: apt install curl gpg
 
       - name: Upload to codecov.io
         uses: codecov/codecov-action@v5