clear `generated/` folder before (re-)creating the files

It looks like we don't delete obsolete files from `generated/`. In v8.0.0, there are some files that shouldn't be there:

- [ghes-3.2-anicca-diff-to-api.github.com.deref.json](https://github.com/octokit/openapi/blob/v8.0.0/generated/ghes-3.2-anicca-diff-to-api.github.com.deref.json)
- [ghes-3.5-anicca-diff-to-api.github.com.deref.json](https://github.com/octokit/openapi/blob/v8.0.0/generated/ghes-3.5-anicca-diff-to-api.github.com.deref.json)

(plus related versions of the `*diff-to-api.github.com*` spec files

in the [`generated/` folder](https://github.com/octokit/openapi/tree/v8.0.0/generated)

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clear `generated/` folder before (re-)creating the files #306

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clear generated/ folder before (re-)creating the files #306

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clear `generated/` folder before (re-)creating the files #306