Bump postcss from 8.4.4 to 8.4.7

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.4 to 8.4.7.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.4...8.4.7)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "draft-js": "^0.11.7",
     "parcel-bundler": "^1.12.5",
-    "postcss": "^8.4.4",
+    "postcss": "^8.4.7",
     "postcss-preset-env": "^6.7.0",
     "posthtml-extend": "^0.6.2",
     "prettier": "^2.5.0",