Bump @astrojs/language-server from 2.15.0 to 2.15.4 in /language-server (#105)

Bumps [@astrojs/language-server](https://github.com/withastro/language-tools/tree/HEAD/packages/language-server) from 2.15.0 to 2.15.4.
- [Release notes](https://github.com/withastro/language-tools/releases)
- [Changelog](https://github.com/withastro/language-tools/blob/main/packages/language-server/CHANGELOG.md)
- [Commits](https://github.com/withastro/language-tools/commits/@astrojs/language-server@2.15.4/packages/language-server)

---
updated-dependencies:
- dependency-name: "@astrojs/language-server"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

language-server/package-lock.json

@@ -3,7 +3,7 @@
 	"private": true,
 	"version": "1.0.0",
 	"dependencies": {
-		"@astrojs/language-server": "^2.15.0",
+		"@astrojs/language-server": "^2.15.4",
 		"prettier": "^3.4.2",
 		"prettier-plugin-astro": "^0.14.1",
 		"typescript": "^5.7.2"