fix(deps): update dependency org.springframework.ai:spring-ai-bom to v1.1.8

Author: renovate[bot]

gradle/libs.versions.toml

@@ -31,7 +31,7 @@ openai = "4.39.1"
 openrewrite = "7.37.0"
 slf4j = "2.0.18"
 spring = "6.2.19"
-spring-ai = "1.1.7"
+spring-ai = "1.1.8"
 system-stubs = "2.1.8"
 jansi = "2.4.3"
 knit = "0.5.1"