fix(deps): update dependency com.google.genai:google-genai to v1.13.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ datafaker = "2.4.4"
 detekt = "1.23.8"
 dokka = "2.0.0"
 finchly = "0.1.1"
-google-genai = "1.12.0"
+google-genai = "1.13.0"
 google-adk = "0.2.0"
 junitJupiter = "5.13.4"
 kotest = "5.9.1"