Upgrade to Tomcat 7.0.57

Closes spring-projectsgh-1936

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -116,7 +116,7 @@
 		<thymeleaf.version>2.1.3.RELEASE</thymeleaf.version>
 		<thymeleaf-extras-springsecurity3.version>2.1.1.RELEASE</thymeleaf-extras-springsecurity3.version>
 		<thymeleaf-layout-dialect.version>1.2.7</thymeleaf-layout-dialect.version>
-		<tomcat.version>7.0.56</tomcat.version>
+		<tomcat.version>7.0.57</tomcat.version>
 		<velocity.version>1.7</velocity.version>
 		<velocity-tools.version>2.0</velocity-tools.version>
 		<wsdl4j.version>1.6.3</wsdl4j.version>