codegen breaks with latest `core-js`

As described by the title, here's the error when I was trying to run apollo client:codegen:
```bash
Error: Cannot find module 'core-js/features/array/flat'
```

Install core-js@3.24.0 fixes the issue, but I think the package should not have core-js@^3.0.1 as deps.

Start by locating the package dependency declaration for core-js and reproduce the failure with the apollo client:codegen command. Check how the declared version range resolves against current core-js releases. Done means codegen runs without the missing core-js/features/array/flat error using the supported dependency range.

Written by the indexing model from the issue text.