Bump com.openai:openai-java in /projects/mcp/mcp-demo

Bumps [com.openai:openai-java](https://github.com/openai/openai-java) from 2.2.0 to 4.8.0.
- [Release notes](https://github.com/openai/openai-java/releases)
- [Changelog](https://github.com/openai/openai-java/blob/main/CHANGELOG.md)
- [Commits](openai/openai-java@v2.2.0...v4.8.0)

---
updated-dependencies:
- dependency-name: com.openai:openai-java
  dependency-version: 4.8.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

projects/mcp/mcp-demo/gradle/libs.versions.toml

@@ -8,7 +8,7 @@ mcp = "0.8.0"
 slf4j = "2.0.17"
 ktor = "3.3.3"
 shadow = "9.2.2"
-openai = "2.2.0"
+openai = "4.8.0"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }