Fixed codecov for repository (#636)

## Changes
<!-- Summary of your changes that are easy to understand -->
Same as:
databricks/terraform-provider-databricks#3530

## Tests
<!-- 
How is this tested? Please see the checklist below and also describe any
other relevant tests
-->
CI:
```
info - 2024-05-03 09:57:07,135 -- > /home/runner/work/databricks-sdk-py/databricks-sdk-py/coverage.xml
info - 2024-05-03 09:57:07,425 -- Your upload is now processing. When finished, results will be available at: https://app.codecov.io/github/databricks/databricks-sdk-py/commit/67211d374104c143c07a62ebd2f4ab3f61f613a2
info - 2024-05-03 09:57:07,600 -- Process Upload complete
```
- [ ] `make test` run locally
- [ ] `make fmt` applied
- [ ] relevant integration tests applied

Author: tanmay-db

.github/workflows/push.yml

@@ -28,7 +28,9 @@ jobs:
         run: make dev install test
 
       - name: Publish test coverage
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v4
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   fmt:
     runs-on: ubuntu-latest