Serialize the entire HTTPClientTests suite

Author: cmcgee1024

Tests/SwiftlyTests/HTTPClientTests.swift

@@ -4,7 +4,7 @@ import Foundation
 @testable import SwiftlyCore
 import Testing
 
-@Suite struct HTTPClientTests {
+@Suite(.serialized) struct HTTPClientTests {
     @Test func getSwiftOrgGPGKeys() async throws {
         let httpClient = SwiftlyHTTPClient(httpRequestExecutor: HTTPRequestExecutorImpl())
 
@@ -38,7 +38,6 @@ import Testing
     }
 
     @Test(
-        .serialized,
         arguments:
         [PlatformDefinition.macOS, .ubuntu2404, .ubuntu2204, .rhel9, .fedora39, .amazonlinux2, .debian12],
         [Components.Schemas.Architecture.x8664, .aarch64]