Swift 5.7 fixes (#1089)

* Fix Swift 5.7 warnings

* Fix Swift 5.7 threading issue

Author: stephencelis

Examples/CaseStudies/SwiftUICaseStudies/01-GettingStarted-FocusState.swift

@@ -75,7 +75,7 @@
   }
 
   extension View {
-    func synchronize<Value: Equatable>(
+    func synchronize<Value>(
       _ first: Binding<Value>,
       _ second: FocusState<Value>.Binding
     ) -> some View {

Sources/ComposableArchitecture/Internal/Deprecations.swift

@@ -616,7 +616,6 @@ extension ForEachStore {
   )
   where
     Data == [EachState],
-    EachContent: View,
     Content == WithViewStore<
       [ID], (Data.Index, EachAction), ForEach<[(offset: Int, element: ID)], ID, EachContent>
     >
@@ -644,7 +643,6 @@ extension ForEachStore {
   )
   where
     Data == [EachState],
-    EachContent: View,
     Content == WithViewStore<
       [ID], (Data.Index, EachAction), ForEach<[(offset: Int, element: ID)], ID, EachContent>
     >,

Sources/ComposableArchitecture/SwiftUI/ForEachStore.swift

@@ -86,7 +86,6 @@ where Data: Collection, ID: Hashable, Content: View {
     @ViewBuilder content: @escaping (Store<EachState, EachAction>) -> EachContent
   )
   where
-    EachContent: View,
     Data == IdentifiedArray<ID, EachState>,
     Content == WithViewStore<
       OrderedSet<ID>, (ID, EachAction), ForEach<OrderedSet<ID>, ID, EachContent>

Sources/ComposableArchitecture/ViewStore.swift

@@ -436,6 +436,7 @@ private struct HashableWrapper<Value>: Hashable {
     ///   - action: An action.
     ///   - predicate: A predicate on `State` that determines for how long this method should
     ///     suspend.
+    @MainActor
     public func send(
       _ action: Action,
       while predicate: @escaping (State) -> Bool