chore: Update config/versions.yml apm-agent-java 1.56.0 (#3515)

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Author: elastic-observability-automation[bot]

config/versions.yml

@@ -47,7 +47,7 @@ versioning_systems:
     current: 2.7.12
   apm-agent-java:
     base: 1.0
-    current: 1.55.6
+    current: 1.56.0
   apm-agent-node:
     base: 4.0
     current: 4.15.0