build(deps): bump dev.langchain4j:langchain4j-bom from 1.11.0 to 1.12.2

Bumps [dev.langchain4j:langchain4j-bom](https://github.com/langchain4j/langchain4j) from 1.11.0 to 1.12.2.
- [Release notes](https://github.com/langchain4j/langchain4j/releases)
- [Commits](langchain4j/langchain4j@1.11.0...1.12.2)

---
updated-dependencies:
- dependency-name: dev.langchain4j:langchain4j-bom
  dependency-version: 1.12.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

platform/build.gradle

@@ -24,7 +24,7 @@ dependencies {
     def jacksonVersion = "2.21.1"
     def jacksonAnnotationsVersion = "2.21"
     def jugVersion = "5.2.0"
-    def langchain4jVersion = "1.11.0"
+    def langchain4jVersion = "1.12.2"
     def langchain4jCommunityVersion = "1.11.0-beta19"
     def jettyVersion = "12.0.31" // Wiremock uses an older version as Micronaut