Bump postcss in /packages/tailwindcss-language-service

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.6 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@8.2.6...8.2.10)

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

Author: dependabot[bot]

packages/tailwindcss-language-service/package-lock.json

@@ -23,7 +23,7 @@
     "line-column": "1.0.2",
     "moo": "0.5.1",
     "multi-regexp2": "1.0.3",
-    "postcss": "8.2.6",
+    "postcss": "8.2.10",
     "postcss-selector-parser": "6.0.2",
     "semver": "7.3.2",
     "sift-string": "0.0.2",