Fixup servlet dep

Author: philwebb

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -2057,6 +2057,7 @@ bom {
 				"spring-boot-security-oauth2-resource-server",
 				"spring-boot-security-saml2",
 				"spring-boot-sendgrid",
+				"spring-boot-servlet",
 				"spring-boot-session",
 				"spring-boot-session-data-mongodb",
 				"spring-boot-session-data-redis",