build(deps-dev): bump autoprefixer from 9.8.8 to 10.4.20 in /Web

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.8.8 to 10.4.20.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@9.8.8...10.4.20)

---
updated-dependencies:
- dependency-name: autoprefixer
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Web/package.json

@@ -13,7 +13,7 @@
   "devDependencies": {
     "@babel/core": "^7.15.5",
     "@vue/compiler-sfc": "^3.2.16",
-    "autoprefixer": "^9.8.7",
+    "autoprefixer": "^10.4.20",
     "axios": "^0.24.0",
     "babel-loader": "^8.2.2",
     "babel-preset-es2015": "^6.24.1",