Bump graphql-spring-boot-starter in /plugins/maven/example-client (#216)

Bumps [graphql-spring-boot-starter](https://github.com/graphql-java-kickstart/graphql-spring-boot) from 7.0.1 to 7.1.0.
- [Release notes](https://github.com/graphql-java-kickstart/graphql-spring-boot/releases)
- [Commits](https://github.com/graphql-java-kickstart/graphql-spring-boot/compare/v7.0.1...v7.1.0)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

plugins/maven/example-client/pom.xml

@@ -99,7 +99,7 @@
         <dependency>
             <groupId>com.graphql-java-kickstart</groupId>
             <artifactId>graphql-spring-boot-starter</artifactId>
-            <version>7.0.1</version>
+            <version>7.1.0</version>
         </dependency>
         <dependency>
             <groupId>com.graphql-java-kickstart</groupId>