Move CURATOR_VER constant to right before its use

Change-Id: I77cc0442b9755c978769fc364c46a249c16220b1
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 9f69653..369f6e0 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -19,7 +19,6 @@
     )
 
     BYTE_BUDDY_VER = "1.9.10"
-    CURATOR_VER = "4.2.0"
 
     maven_jar(
         name = "byte-buddy",
@@ -51,6 +50,8 @@
         sha1 = "932d1baa2541f218b1b44a0546ae83d530011468",
     )
 
+    CURATOR_VER = "4.2.0"
+
     maven_jar(
         name = "curator-test",
         artifact = "org.apache.curator:curator-test:" + CURATOR_VER,