fix: resolve Swift 6.0 strict concurrency and deprecation warnings

- Updated Package.swift: replaced deprecated swiftLanguageVersions with swiftLanguageModes
- Added Sendable conformance to StatusCodeResponse and EmptyResponse to fix strict concurrency errors
- Fixed unused variable warning in HighCoverageTests.swift
- All tests pass (115 tests)
- Build completes without errors or warnings

Author: Emil Karimov

Package.swift

@@ -23,5 +23,5 @@ let package = Package(
             dependencies: ["EKNetwork"]
         ),
     ],
-    swiftLanguageVersions: [.v6]
+    swiftLanguageModes: [.v6]
 )

Sources/EKNetwork/NetworkManager.swift

@@ -213,7 +213,7 @@ public struct HTTPError: LocalizedError {
 }
 
 /// Convenience response that only exposes the HTTP status code and headers.
-public struct StatusCodeResponse: Decodable, Equatable {
+public struct StatusCodeResponse: Decodable, Equatable, Sendable {
     public let statusCode: Int
     public let headers: [String: String]
 
@@ -235,7 +235,7 @@ public struct StatusCodeResponse: Decodable, Equatable {
 }
 
 /// Represents an empty payload. Useful for endpoints that only signal success via status code.
-public struct EmptyResponse: Decodable, Equatable {
+public struct EmptyResponse: Decodable, Equatable, Sendable {
     public init() {}
 }
 

Tests/EKNetworkTests/HighCoverageTests.swift

@@ -114,7 +114,7 @@ func testURLComponentsInvalidQuery() async throws {
         }
     }
 
-    let manager = NetworkManager(baseURL: URL(string: "https://api.test")!)
+    _ = NetworkManager(baseURL: URL(string: "https://api.test")!)
 
     // This should still work, but tests the URLComponents path
     class TestProtocol: URLProtocol {