Merge pull request #29 from codecov/update-to-v4

chore(ci): upgrade to v4

Author: thomasrockhu-codecov

.github/workflows/rust.yml

@@ -35,7 +35,7 @@ jobs:
     - name: Codecov
       # You may pin to the exact commit or the version.
       # uses: codecov/codecov-action@81cd2dc8148241f03f5839d295e000b8f761e378
-      uses: codecov/codecov-action@v4-beta
+      uses: codecov/codecov-action@v4
       env:
         CODECOV_TOKEN: ${{ secrets.CODECOV_ORG_TOKEN }}
       with: