CI: unstable Codecov Report

- [x] I have checked the [discussions](https://github.com/ctripcorp/apollo/discussions)
- [x] I have searched the [issues](https://github.com/ctripcorp/apollo/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [FAQ](https://www.apolloconfig.com/#/zh/faq/common-issues-in-deployment-and-development-phase) of this repository and believe that this is not a duplicate.

**Describe the bug**

Sometimes in Codecov Report, coverage will decrease even change non .java file.

**To Reproduce**

Change an index.html like https://github.com/apolloconfig/apollo/pull/4908

**Expected behavior**
Coverage of project should be same as previous commit.

**Screenshots**

https://github.com/apolloconfig/apollo/pull/4908#issuecomment-1599772570


https://github.com/apolloconfig/apollo/pull/4908/checks?check_run_id=14705443703