chore(deps): update dependency @octokit/tsconfig to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@octokit/tsconfig	^3.0.0 -> ^4.0.0

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Release Notes

octokit/tsconfig (@​octokit/tsconfig)

v4.0.0

Compare Source

Features

• enable exactOptioanlPropertyTypes option (#​30) (1dc9e40), closes #​29

BREAKING CHANGES

• Required, but potentially undefined does not have the same intent as optional. This
  rule will enforce us to be explicit in our type declarations and how we expect octokit APIs should
  be used.

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[oscard0m]

Relates to octokit/tsconfig#29 (comment)

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Before the change?

• We were testing types without --exactOptionalPropertyTypes option

After the change?

• We start testing types with --exactOptionalPropertyTypes option

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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