Bump postcss and vue-loader

Bumps [postcss](https://github.com/postcss/postcss) to 8.4.38 and updates ancestor dependency [vue-loader](https://github.com/vuejs/vue-loader). These dependencies need to be updated together.


Updates `postcss` from 7.0.39 to 8.4.38
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@7.0.39...8.4.38)

Updates `vue-loader` from 15.10.2 to 17.4.2
- [Release notes](https://github.com/vuejs/vue-loader/releases)
- [Changelog](https://github.com/vuejs/vue-loader/blob/main/CHANGELOG.md)
- [Commits](vuejs/vue-loader@v15.10.2...v17.4.2)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: vue-loader
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -15,7 +15,7 @@
         "postcss": "^8.4.38",
         "sass": "^1.32.12",
         "vite": "^4.0.0",
-        "vue-loader": "^15.10.0"
+        "vue-loader": "^17.4.2"
     },
     "dependencies": {
         "@vitejs/plugin-vue2": "^2.0.0",