Fix codecov (#220)

Author: buenaflor

.github/workflows/kotlin-multiplatform.yml

@@ -90,9 +90,10 @@ jobs:
 
       # Kover coverage currently only works for JVM
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d # pin@v3
+        uses: codecov/codecov-action@5ecb98a3c6b747ed38dc09f787459979aebb39be # pin@v4
         with:
           name: sentry-kotlin-multiplatform
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   archive-distribution:
     runs-on: macos-latest-xlarge