Remove dependency management for spring-boot-starter-mobile

See gh-10884

Author: wilkinsona

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -460,11 +460,6 @@
 				<artifactId>spring-boot-starter-mail</artifactId>
 				<version>${revision}</version>
 			</dependency>
-			<dependency>
-				<groupId>org.springframework.boot</groupId>
-				<artifactId>spring-boot-starter-mobile</artifactId>
-				<version>${revision}</version>
-			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-mustache</artifactId>