Bump the webpack group in /src/Client with 2 updates

Bumps the webpack group in /src/Client with 2 updates: [postcss-loader](https://github.com/webpack-contrib/postcss-loader) and [webpack](https://github.com/webpack/webpack).


Updates `postcss-loader` from 8.1.1 to 8.2.0
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack/postcss-loader/blob/main/CHANGELOG.md)
- [Commits](webpack/postcss-loader@v8.1.1...v8.2.0)

Updates `webpack` from 5.99.5 to 5.102.1
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.99.5...v5.102.1)

---
updated-dependencies:
- dependency-name: postcss-loader
  dependency-version: 8.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: webpack
- dependency-name: webpack
  dependency-version: 5.102.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: webpack
...

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

Author: dependabot[bot]

src/Client/package-lock.json

@@ -12,7 +12,7 @@
     "@kentico/xperience-admin-base": "30.4.2",
     "@kentico/xperience-admin-components": "30.4.2",
     "css-loader": "^7.1.2",
-    "postcss-loader": "^8.1.1",
+    "postcss-loader": "^8.2.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "style-loader": "^4.0.0"
@@ -28,7 +28,7 @@
     "@types/react-dom": "^18.3.6",
     "babel-loader": "^10.0.0",
     "postcss": "^8.5.3",
-    "webpack": "5.99.5",
+    "webpack": "5.102.1",
     "webpack-cli": "^6.0.1",
     "webpack-dev-server": "^5.2.2"
   },