Raise the version of the supported specification

Author: devcrocod

kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types/common.kt

@@ -8,10 +8,11 @@ import kotlinx.serialization.json.JsonObject
 // Protocol Version Constants
 // ============================================================================
 
-public const val LATEST_PROTOCOL_VERSION: String = "2025-03-26"
+public const val LATEST_PROTOCOL_VERSION: String = "2025-06-18"
 
 public val SUPPORTED_PROTOCOL_VERSIONS: List<String> = listOf(
     LATEST_PROTOCOL_VERSION,
+    "2025-03-26",
     "2024-11-05",
 )
 

kotlin-sdk-core/src/commonTest/kotlin/io/modelcontextprotocol/kotlin/sdk/OldSchemaTypesTest.kt

@@ -16,15 +16,15 @@ class OldSchemaTypesTest {
     @Test
     fun `should have correct latest protocol version`() {
         assertNotEquals("", LATEST_PROTOCOL_VERSION)
-        assertEquals("2025-03-26", LATEST_PROTOCOL_VERSION)
+        assertEquals("2025-06-18", LATEST_PROTOCOL_VERSION)
     }
 
     @Test
     fun `should have correct supported protocol versions`() {
         assertIs<List<String>>(SUPPORTED_PROTOCOL_VERSIONS)
         assertTrue(SUPPORTED_PROTOCOL_VERSIONS.contains(LATEST_PROTOCOL_VERSION))
         assertTrue(SUPPORTED_PROTOCOL_VERSIONS.contains("2024-11-05"))
-        assertEquals(2, SUPPORTED_PROTOCOL_VERSIONS.size)
+        assertEquals(3, SUPPORTED_PROTOCOL_VERSIONS.size)
     }
 
     @Test

kotlin-sdk-core/src/commonTest/kotlin/io/modelcontextprotocol/kotlin/sdk/types/CommonTypeTest.kt

@@ -13,15 +13,16 @@ class CommonTypeTest {
     @Test
     fun `should have correct latest protocol version`() {
         assertNotEquals("", LATEST_PROTOCOL_VERSION)
-        assertEquals("2025-03-26", LATEST_PROTOCOL_VERSION)
+        assertEquals("2025-06-18", LATEST_PROTOCOL_VERSION)
     }
 
     @Test
     fun `should have correct supported protocol versions`() {
         assertIs<List<String>>(SUPPORTED_PROTOCOL_VERSIONS)
         assertTrue(SUPPORTED_PROTOCOL_VERSIONS.contains(LATEST_PROTOCOL_VERSION))
+        assertTrue(SUPPORTED_PROTOCOL_VERSIONS.contains("2025-03-26"))
         assertTrue(SUPPORTED_PROTOCOL_VERSIONS.contains("2024-11-05"))
-        assertEquals(2, SUPPORTED_PROTOCOL_VERSIONS.size)
+        assertEquals(3, SUPPORTED_PROTOCOL_VERSIONS.size)
     }
 
     @Test