Update to thymeleaf-spring5 3.0.12

Closes gh-9437

Author: jzheaux

gradle/dependency-management.gradle

@@ -211,7 +211,7 @@ dependencyManagement {
 		dependency 'org.sonatype.sisu.inject:cglib:2.2.1-v20090111'
 		dependency 'org.springframework.ldap:spring-ldap-core:2.3.3.RELEASE'
 		dependency 'org.synchronoss.cloud:nio-multipart-parser:1.1.0'
-		dependency 'org.thymeleaf:thymeleaf-spring5:3.0.11.RELEASE'
+		dependency 'org.thymeleaf:thymeleaf-spring5:3.0.12.RELEASE'
 		dependency 'org.unbescape:unbescape:1.1.5.RELEASE'
 		dependency 'org.w3c.css:sac:1.3'
 		dependency 'xalan:serializer:2.7.2'