Update to Boot 1.5.8.RELEASE

Fixes gh-4784

gradle/javaprojects.gradle

@@ -36,7 +36,7 @@ ext.springDataCommonsVersion = '1.12.2.RELEASE'
 ext.springDataJpaVersion = '1.10.2.RELEASE'
 ext.springDataRedisVersion = '1.7.2.RELEASE'
 ext.springSessionVersion = '1.2.1.RELEASE'
-ext.springBootVersion = '1.5.0.BUILD-SNAPSHOT'
+ext.springBootVersion = '1.5.8.RELEASE'
 ext.thymeleafVersion = '3.0.2.RELEASE'
 ext.jsonassertVersion = '1.4.0'
 ext.validationApiVersion = '1.1.0.Final'