update spring version catalog

update to 4.3.15.release

Issue-ID: SDC-1322
Change-Id: I65032e33d77c83ef4031f4a55426b3653f5e48b1
Signed-off-by: Michael Lando <ml636r@att.com>
diff --git a/pom.xml b/pom.xml
index 969288d..99f43bf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
         <titan.version>1.0.0</titan.version>
         <sdc.titan.version>1.2.0</sdc.titan.version>
         <spring-boot.version>1.1.6.RELEASE</spring-boot.version>
-        <spring.version>4.3.13.RELEASE</spring.version>
+        <spring.version>4.3.15.RELEASE</spring.version>
         <spring.security.version>3.2.3.RELEASE</spring.security.version>
         <spring.ldap.version>2.0.1.RELEASE</spring.ldap.version>
         <jersey-bom.version>2.26</jersey-bom.version>