[Babel] Use Spring Boot 1.5.15

Upgrade from 1.5.14 to avoid known vulnerabilities.

Change-Id: I83e1b4a62da8312e1785bd6954f9b2644f65bdaa
Issue-ID: AAI-1508
Signed-off-by: mark.j.leonard <mark.j.leonard@gmail.com>
diff --git a/pom.xml b/pom.xml
index a950159..e63b674 100644
--- a/pom.xml
+++ b/pom.xml
@@ -42,7 +42,7 @@
 
 	<properties>
 		<!-- Spring boot version -->
-		<spring.boot.version>1.5.14.RELEASE</spring.boot.version>
+		<spring.boot.version>1.5.15.RELEASE</spring.boot.version>
 
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>