Pessoal, para utilizar o Bootstrap corretamente, precisei importar a dependencia do Bootstrap com versão e do Config Client também. Vou deixar aqui, caso alguém tenha a mesma dificuldade:
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-config-client -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-client</artifactId>
<version>3.0.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-bootstrap -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bootstrap</artifactId>
<version>3.0.4</version>
</dependency>