chore(deps): update dependency org.springframework.boot:spring-boot-starter-test to v4

Author: renovate[bot]

spring-java17/build.gradle.kts

@@ -1,7 +1,7 @@
 dependencies {
     api(project(":cache-core"))
     implementation("org.springframework:spring-context:6.2.18")
-    testImplementation("org.springframework.boot:spring-boot-starter-test:3.5.14")
+    testImplementation("org.springframework.boot:spring-boot-starter-test:4.0.6")
     testImplementation("org.awaitility:awaitility:4.3.0")
     testImplementation(testFixtures(project(":cache-core")))
     testImplementation(project(":cache-provider-caffeine"))