Bump postcss and vue-loader

Bumps [postcss](https://github.com/postcss/postcss) to 8.5.15 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 8.5.15
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@7.0.39...8.5.15)

Updates `vue-loader` from 15.11.1 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@v15.11.1...v17.4.2)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.10
  dependency-type: indirect
- dependency-name: vue-loader
  dependency-version: 17.4.2
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
         "resolve-url-loader": "5.0.0",
         "sass": "1.71.1",
         "sass-loader": "13.3.3",
-        "vue-loader": "15.11.1",
+        "vue-loader": "17.4.2",
         "webpack": "5.104.1"
     },
     "dependencies": {