fix: Migrate to Testcontainers 2.0 PostgreSQLContainer import (#108) (#108)

Replace deprecated org.testcontainers.containers.PostgreSQLContainer
with org.testcontainers.postgresql.PostgreSQLContainer in all three
PostgreSQL integration tests.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: marcosbarbero

scim2-sdk-spring-boot-autoconfigure/src/test/kotlin/com/marcosbarbero/scim2/spring/persistence/PostgresCustomSchemaIT.kt

@@ -23,9 +23,9 @@ import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.boot.test.context.SpringBootTest
 import org.springframework.test.context.DynamicPropertyRegistry
 import org.springframework.test.context.DynamicPropertySource
-import org.testcontainers.containers.PostgreSQLContainer
 import org.testcontainers.junit.jupiter.Container
 import org.testcontainers.junit.jupiter.Testcontainers
+import org.testcontainers.postgresql.PostgreSQLContainer
 
 /**
  * Tests that scim.persistence.schema-name properly configures Hibernate's default schema.

scim2-sdk-spring-boot-autoconfigure/src/test/kotlin/com/marcosbarbero/scim2/spring/persistence/PostgresFlywayMigrationIT.kt

@@ -25,9 +25,9 @@ import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.boot.test.context.SpringBootTest
 import org.springframework.test.context.DynamicPropertyRegistry
 import org.springframework.test.context.DynamicPropertySource
-import org.testcontainers.containers.PostgreSQLContainer
 import org.testcontainers.junit.jupiter.Container
 import org.testcontainers.junit.jupiter.Testcontainers
+import org.testcontainers.postgresql.PostgreSQLContainer
 
 /**
  * Integration test proving the Flyway migration V1__create_scim_resources.sql

scim2-sdk-spring-boot-autoconfigure/src/test/kotlin/com/marcosbarbero/scim2/spring/persistence/PostgresIT.kt

@@ -27,9 +27,9 @@ import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.boot.test.context.SpringBootTest
 import org.springframework.test.context.DynamicPropertyRegistry
 import org.springframework.test.context.DynamicPropertySource
-import org.testcontainers.containers.PostgreSQLContainer
 import org.testcontainers.junit.jupiter.Container
 import org.testcontainers.junit.jupiter.Testcontainers
+import org.testcontainers.postgresql.PostgreSQLContainer
 
 /**
  * Integration test proving JPA persistence works against a real PostgreSQL database.