Bump spring-boot-starter-web in /plugins/gradle/example-server (#487)

Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.4.1 to 2.4.2.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.2)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

plugins/gradle/example-server/build.gradle

@@ -12,7 +12,7 @@ plugins {
 mainClassName = "io.github.kobylynskyi.product.Application"
 
 dependencies {
-    implementation "org.springframework.boot:spring-boot-starter-web:2.4.1"
+    implementation "org.springframework.boot:spring-boot-starter-web:2.4.2"
     implementation "org.springframework.boot:spring-boot-starter-data-mongodb:2.4.1"
 
     implementation "com.graphql-java-kickstart:graphql-spring-boot-starter:8.0.0"