RUN-4569 Mitigate Jackson CVE-2026-54512/54513

Bump rundeck-core to 6.1.0-SNAPSHOT, which pulls the patched jackson-databind 2.22.0 transitively and mitigates CVE-2026-54512 / CVE-2026-54513.

Author: fdevans

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ groovy = "4.0.32"
 jacksonDatabind = "2.22.0"
 nexusPublish = "2.0.0"
 objenesis = "3.4"
-rundeckCore = "6.0.0-alpha1-20260407"
+rundeckCore = "6.1.0-SNAPSHOT"
 slf4j = "2.0.18"
 spock = "2.4-groovy-4.0"
 # Security overrides for transitive dependencies