Update dependency @octokit/auth-app to v7

[gardener-ci-robot]

This PR contains the following updates:

Package	Type	Update	Change
@octokit/auth-app	dependencies	major	^6.0.4 -> ^7.0.0

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Release Notes

octokit/auth-app.js (@​octokit/auth-app)

v7.1.0

Compare Source

Features

• appId argument can be set to Client ID string (#​606) (7dc08e5)

v7.0.0

Compare Source

Features

• v7 (#​580) (3e4d477)

BREAKING CHANGES

• package is now ESM
• remove type "oauth" that was previously deprecated

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[gardener-robot]

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