Update dependency org.springframework.restdocs:spring-restdocs-mockmvc to v4

Author: renovate[bot]

build.gradle

@@ -126,7 +126,7 @@ dependencies {
 
     // Additional libraries for tests
     testImplementation "com.google.guava:guava:33.5.0-jre"
-    testImplementation "org.springframework.restdocs:spring-restdocs-mockmvc:3.0.5"
+    testImplementation "org.springframework.restdocs:spring-restdocs-mockmvc:4.0.0"
     testImplementation "org.springframework.boot:spring-boot-starter-test"
     testImplementation "org.springframework:spring-test"
     testImplementation "org.springframework.security:spring-security-test"