Dependency(deps): Bump dev.langchain4j:langchain4j-bom (#9)

Bumps [dev.langchain4j:langchain4j-bom](https://github.com/langchain4j/langchain4j) from 1.2.0 to 1.8.0.
- [Release notes](https://github.com/langchain4j/langchain4j/releases)
- [Commits](langchain4j/langchain4j@1.2.0...1.8.0)

---
updated-dependencies:
- dependency-name: dev.langchain4j:langchain4j-bom
  dependency-version: 1.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

pom.xml

@@ -61,7 +61,7 @@
       <dependency>
         <groupId>dev.langchain4j</groupId>
         <artifactId>langchain4j-bom</artifactId>
-        <version>1.2.0</version>
+        <version>1.8.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>