fix(deps): update dependency postcss-loader to v7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-loader	6.2.1 -> 7.0.2

---

Release Notes

webpack-contrib/postcss-loader

### [`v7.0.2`](https://togithub.com/webpack-contrib/postcss-loader/blob/HEAD/CHANGELOG.md#​702-httpsgithubcomwebpack-contribpostcss-loadercomparev701v702-2022-11-29) [Compare Source](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.0.1...v7.0.2) ### [`v7.0.1`](https://togithub.com/webpack-contrib/postcss-loader/blob/HEAD/CHANGELOG.md#​701-httpsgithubcomwebpack-contribpostcss-loadercomparev700v701-2022-07-11) [Compare Source](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.0.0...v7.0.1) ### [`v7.0.0`](https://togithub.com/webpack-contrib/postcss-loader/blob/HEAD/CHANGELOG.md#​700-httpsgithubcomwebpack-contribpostcss-loadercomparev621v700-2022-05-18) [Compare Source](https://togithub.com/webpack-contrib/postcss-loader/compare/v6.2.1...v7.0.0) ##### ⚠ BREAKING CHANGES - minimum supported `Node.js` version is `14.15.0` ##### [6.2.1](https://togithub.com/webpack-contrib/postcss-loader/compare/v6.2.0...v6.2.1) (2021-11-26) ##### Bug Fixes - watching configuration ([#​553](https://togithub.com/webpack-contrib/postcss-loader/issues/553)) ([7f165b4](https://togithub.com/webpack-contrib/postcss-loader/commit/7f165b4991b59085651b517d960556a77b72a4d6))

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.