fix(deps): update dependency postcss-safe-parser to v7 (#946)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[postcss-safe-parser](https://redirect.github.com/postcss/postcss-safe-parser)
| [`^6.0.0` ->
`^7.0.0`](https://renovatebot.com/diffs/npm/postcss-safe-parser/6.0.0/7.0.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/postcss-safe-parser/7.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/postcss-safe-parser/7.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss-safe-parser/6.0.0/7.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss-safe-parser/6.0.0/7.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>postcss/postcss-safe-parser (postcss-safe-parser)</summary>

###
[`v7.0.1`](https://redirect.github.com/postcss/postcss-safe-parser/blob/HEAD/CHANGELOG.md#701)

[Compare
Source](https://redirect.github.com/postcss/postcss-safe-parser/compare/7.0.0...7.0.1)

- Fixed JSON inside CSS support (by
[@&#8203;dengelke](https://redirect.github.com/dengelke)).

###
[`v7.0.0`](https://redirect.github.com/postcss/postcss-safe-parser/compare/6.0.0...7.0.0)

[Compare
Source](https://redirect.github.com/postcss/postcss-safe-parser/compare/6.0.0...7.0.0)

</details>

---

### 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.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/sveltejs/eslint-plugin-svelte).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4xOS4wIiwidXBkYXRlZEluVmVyIjoiMzkuMTkuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/eslint-plugin-svelte/package.json

@@ -63,7 +63,7 @@
     "known-css-properties": "^0.35.0",
     "postcss": "^8.4.49",
     "postcss-load-config": "^3.1.4",
-    "postcss-safe-parser": "^6.0.0",
+    "postcss-safe-parser": "^7.0.0",
     "postcss-selector-parser": "^7.0.0",
     "semver": "^7.6.3",
     "svelte-eslint-parser": "^1.0.0-next.4"