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

Author: renovate[bot]

packages/eslint-plugin-svelte/package.json

@@ -63,7 +63,7 @@
     "known-css-properties": "^0.31.0",
     "postcss": "^8.4.38",
     "postcss-load-config": "^3.1.4",
-    "postcss-safe-parser": "^6.0.0",
+    "postcss-safe-parser": "^7.0.0",
     "postcss-selector-parser": "^6.0.16",
     "semver": "^7.6.2",
     "svelte-eslint-parser": "^0.36.0"