Remove @testable from import

Author: andrewheard

Tests/GoogleAITests/GenerationConfigTests.swift

@@ -13,10 +13,9 @@
 // limitations under the License.
 
 import Foundation
+import GoogleGenerativeAI
 import XCTest
 
-@testable import GoogleGenerativeAI
-
 @available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 final class GenerationConfigTests: XCTestCase {
   let encoder = JSONEncoder()