Remove Spring for GraphQL

Closes gh-34

Author: snicoll

build.gradle

@@ -32,7 +32,6 @@ dependencies {
     checkstyle("io.spring.javaformat:spring-javaformat-checkstyle:${javaformatVersion}")
 
 	implementation("org.springframework.boot:spring-boot-starter-cache")
-	implementation("org.springframework.boot:spring-boot-starter-graphql")
 	implementation("org.springframework.boot:spring-boot-starter-hateoas")
 	implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server")
 	implementation("org.springframework.boot:spring-boot-starter-web")
@@ -47,7 +46,6 @@ dependencies {
 
 	testImplementation("com.squareup.okhttp3:mockwebserver:4.12.0")
 	testImplementation("org.springframework.boot:spring-boot-starter-test")
-	testImplementation("org.springframework.graphql:spring-graphql-test")
 	testImplementation("org.springframework.security:spring-security-test")
 	testImplementation("org.springframework.restdocs:spring-restdocs-mockmvc")
 }