Bump postcss from 8.2.2 to 8.2.10 (librenms#12858)

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.2 to 8.2.10.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.2.2...8.2.10)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -19,7 +19,7 @@
         "laravel-mix": "^6.0.6",
         "lodash": "^4.17.21",
         "popper.js": "^1.16.1",
-        "postcss": "^8.2.2",
+        "postcss": "^8.2.10",
         "resolve-url-loader": "^3.1.2",
         "sass": "^1.29.0",
         "sass-loader": "^10.1.0",