Drop iOS 14 and macOS 11 support

Shared/Search/FocusableSearchTextField.swift

@@ -2,7 +2,6 @@ import Introspect
 import Repeat
 import SwiftUI
 
-@available(iOS 15.0, macOS 12, *)
 struct FocusableSearchTextField: View {
     @ObservedObject private var state = SearchModel.shared
 

Shared/Search/SearchView.swift

@@ -95,11 +95,7 @@ struct SearchView: View {
                         filtersMenu
                     }
 
-                    if #available(macOS 12, *) {
-                        FocusableSearchTextField()
-                    } else {
-                        SearchTextField()
-                    }
+                    FocusableSearchTextField()
                 }
             #endif
         }
@@ -179,11 +175,7 @@ struct SearchView: View {
                 searchMenu
             }
             ToolbarItem(placement: .principal) {
-                if #available(iOS 15, *) {
-                    FocusableSearchTextField()
-                } else {
-                    SearchTextField()
-                }
+                FocusableSearchTextField()
             }
         }
         .navigationBarTitleDisplayMode(.inline)