feat: correction of integration tests with serialization

build.gradle.kts

src/main/kotlin/configuration/ApiConfiguration.kt

src/main/kotlin/player/PlayerRepository.kt

src/main/kotlin/player/dtos/PlayerCreationDTO.kt

src/main/kotlin/player/dtos/PlayerInfoDTO.kt

src/main/kotlin/player/dtos/PlayerUpdateDTO.kt

src/test/kotlin/player/PlayerIntegrationTest.kt

src/test/kotlin/player/PlayerServiceTest.kt

src/test/resources/application-test.yaml