Updates Curator to 5.6.0 to avoid Cache loading failure when there ar…

…e too many child nodes (#29795)

distribution/proxy/src/main/release-docs/LICENSE

@@ -233,9 +233,9 @@ The text of each license is the standard Apache 2.0 license.
     commons-math3 3.6.1: https://commons.apache.org/proper/commons-math, Apache 2.0
     commons-pool2 2.6.1: https://commons.apache.org/proper/commons-pool, Apache 2.0
     commons-logging 1.1.3: https://github.com/apache/commons-logging, Apache 2.0
-    curator-client 5.5.0:  https://github.com/apache/curator, Apache 2.0
-    curator-framework 5.5.0:  https://github.com/apache/curator, Apache 2.0
-    curator-recipes 5.5.0:  https://github.com/apache/curator, Apache 2.0
+    curator-client 5.6.0:  https://github.com/apache/curator, Apache 2.0
+    curator-framework 5.6.0:  https://github.com/apache/curator, Apache 2.0
+    curator-recipes 5.6.0:  https://github.com/apache/curator, Apache 2.0
     error_prone_annotations 2.22.0: https://github.com/google/error-prone, Apache 2.0
     failsafe 2.4.4: https://github.com/jhalterman/failsafe, Apache 2.0
     failureaccess 1.0.1: https://github.com/google/guava, Apache 2.0

pom.xml

@@ -102,7 +102,7 @@
         <netty.version>4.1.99.Final</netty.version>
         <bouncycastle.version>1.70</bouncycastle.version>
 
-        <curator.version>5.5.0</curator.version>
+        <curator.version>5.6.0</curator.version>
         <zookeeper.version>3.9.1</zookeeper.version>
         <audience-annotations.version>0.12.0</audience-annotations.version>
         <jetcd.version>0.7.6</jetcd.version>