Add compile time guards for Linux for testTextState.

Fix Todos app reducer caused by merge issues.
Drop support for Xcode 11.7

Author: mluisbrown

.github/workflows/ci.yml

@@ -14,7 +14,6 @@ jobs:
     strategy:
       matrix:
         xcode:
-          - 11.7
           - 12.4
     steps:
       - uses: actions/checkout@v2

Examples/Todos/Todos/Todos.swift

@@ -39,6 +39,11 @@ struct AppEnvironment {
 }
 
 let appReducer = Reducer<AppState, AppAction, AppEnvironment>.combine(
+  todoReducer.forEach(
+     state: \.todos,
+     action: /AppAction.todo(id:action:),
+     environment: { _ in TodoEnvironment() }
+  ),
   Reducer { state, action, environment in
     switch action {
     case .addTodoButtonTapped:

Tests/ComposableArchitectureTests/DebugTests.swift

@@ -344,6 +344,8 @@ final class DebugTests: XCTestCase {
     )
   }
 
+#if canImport(SwiftUI)
+  @available(iOS 13, macOS 10.15, macCatalyst 13, tvOS 13, watchOS 6, *)
   func testTextState() {
     XCTAssertEqual(
       debugOutput(
@@ -410,6 +412,7 @@ final class DebugTests: XCTestCase {
       """
     )
   }
+#endif
 
   func testEffectOutput() {
     //    XCTAssertEqual(