Update dependency org.slf4j:slf4j-api to v2

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ jacksonDatabind = "2.21.2"
 nexusPublish = "2.0.0"
 objenesis = "3.4"
 rundeckCore = "6.0.0-alpha1-20260407"
-slf4j = "1.7.36"
+slf4j = "2.0.18"
 spock = "2.4-groovy-4.0"
 # Security overrides for transitive dependencies
 commonsLang3 = "3.20.0"