Bump springboot from 1.15.14 to 1.15.19

This indirectly upgrades jackson-databind to 2.8.11.3 which resolves the
selected version for a number of dependencies.

Although reporting an error this release fixes:
CVE-2018-14718: RCE with slf4j-ext jar
CVE-2018-14719: RCE with blaze-ds-opt, -core jars
CVE-2018-14720: exfiltration/XXE with only JDK classes (some JDK
versions)
CVE-2018-14721: exfiltration/SSRF with axis2-jaxws
Ref FasterXML/jackson-databind#2097

CVE-2018-19360 (axis2-transport-jms)
CVE-2018-19361 (openjpa)
CVE-2018-19362 (jboss-common-core)
Ref FasterXML/jackson-databind#2186

See
FasterXML/jackson-databind#2097 (comment)
https://github.com/FasterXML/jackson-databind/blob/2.8/release-notes/VERSION#L8-L15

RDM-3796

Author: Dwayne Bailey

build.gradle

@@ -10,7 +10,7 @@ buildscript {
 plugins {
     id 'application'
     id 'io.spring.dependency-management' version '1.0.6.RELEASE'
-    id 'org.springframework.boot' version '1.5.14.RELEASE'
+    id 'org.springframework.boot' version '1.5.19.RELEASE'
     id 'org.owasp.dependencycheck' version '3.3.2'
     id 'se.patrikerdes.use-latest-versions' version '0.2.3'
     id 'com.github.ben-manes.versions' version '0.20.0'