upgrade to Spring Boot 4.2.1

src/test/kotlin/io/kotest/provided/ProjectConfig.kt

@@ -0,0 +1,8 @@
+package io.kotest.provided
+
+import io.kotest.core.config.AbstractProjectConfig
+import io.kotest.extensions.spring.SpringExtension
+
+object ProjectConfig : AbstractProjectConfig() {
+    override val extensions = listOf(SpringExtension())
+}