Update dependency eslint to v7.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint (source)	7.14.0 -> 7.15.0

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Release Notes

eslint/eslint

### [`v7.15.0`](https://togithub.com/eslint/eslint/releases/v7.15.0) [Compare Source](https://togithub.com/eslint/eslint/compare/v7.14.0...v7.15.0) - [`5c11aab`](https://togithub.com/eslint/eslint/commit/5c11aabbe8249aeb8cad29bc6a33fc20c8c683ef) Upgrade: [@​eslint/esintrc](https://togithub.com/eslint/esintrc) and espree for bug fixes (refs [#​13878](https://togithub.com/eslint/eslint/issues/13878)) ([#​13908](https://togithub.com/eslint/eslint/issues/13908)) (Brandon Mills) - [`0eb7957`](https://togithub.com/eslint/eslint/commit/0eb7957e27fd521317bd5c8479ce7abc1399169c) Upgrade: file-entry-cache@6.0.0 ([#​13877](https://togithub.com/eslint/eslint/issues/13877)) (Rouven Weßling) - [`683ad00`](https://togithub.com/eslint/eslint/commit/683ad00c41e1ae4d889deff82b2a94318e8c2129) New: no-unsafe-optional-chaining rule (fixes [#​13431](https://togithub.com/eslint/eslint/issues/13431)) ([#​13859](https://togithub.com/eslint/eslint/issues/13859)) (YeonJuan) - [`cbc57fb`](https://togithub.com/eslint/eslint/commit/cbc57fb7d07c00663ed5781f5e6bc8f534cc2d76) Fix: one-var autofixing for export (fixes [#​13834](https://togithub.com/eslint/eslint/issues/13834)) ([#​13891](https://togithub.com/eslint/eslint/issues/13891)) (Anix) - [`110cf96`](https://togithub.com/eslint/eslint/commit/110cf962d05625a8a1bf7b5f4ec2194db150eb32) Docs: Fix a broken link in working-with-rules.md ([#​13875](https://togithub.com/eslint/eslint/issues/13875)) (Anton Niklasson)

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