chore: Update config/versions.yml apm-agent-node 4.15.0 (#2062)

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Author: elastic-observability-automation[bot]

config/versions.yml

@@ -50,7 +50,7 @@ versioning_systems:
     current: 1.55.1
   apm-agent-node:
     base: 4.0
-    current: 4.14.0
+    current: 4.15.0
   apm-agent-php:
     base: 1.0
     current: 1.15.1