Upgrade to AssertJ 3.27.4

Closes gh-992

Author: wilkinsona

spring-restdocs-platform/build.gradle

@@ -18,7 +18,6 @@ dependencies {
 		api("org.apiguardian:apiguardian-api:1.1.2")
 		api("org.asciidoctor:asciidoctorj:3.0.0")
 		api("org.asciidoctor:asciidoctorj-pdf:2.3.19")
-		api("org.assertj:assertj-core:3.27.3")
 		api("org.hamcrest:hamcrest-core:1.3")
 		api("org.hamcrest:hamcrest-library:1.3")
 		api("org.hibernate.validator:hibernate-validator:9.0.1.Final")
@@ -27,6 +26,7 @@ dependencies {
 	}
 	api(enforcedPlatform("com.fasterxml.jackson:jackson-bom:2.20.0-rc1"))
 	api(enforcedPlatform("io.rest-assured:rest-assured-bom:5.5.6"))
+	api(enforcedPlatform("org.assertj:assertj-core:3.27.4"))
 	api(enforcedPlatform("org.mockito:mockito-bom:5.19.0"))
 	api(enforcedPlatform("org.junit:junit-bom:5.13.4"))
 	api(enforcedPlatform("org.springframework:spring-framework-bom:$springFrameworkVersion"))