fix: replace deprecated foregroundColor, cornerRadius, and font APIs

Author: systemblueteam

Demo/Shared/ContentView.swift

@@ -150,15 +150,15 @@ struct ContentView: View {
                 Keyboard(latching: true, noteOn: noteOn, noteOff: noteOff) { pitch, isActivated in
                     if isActivated {
                         ZStack {
-                            Rectangle().foregroundColor(.black)
+                            Rectangle().foregroundStyle(.black)
                             VStack {
                                 Spacer()
                                 Text(pitch.note(in: .C).description).font(.largeTitle)
                             }.padding()
                         }
 
                     } else {
-                        Rectangle().foregroundColor(randomColors[Int(pitch.intValue) % 12])
+                        Rectangle().foregroundStyle(randomColors[Int(pitch.intValue) % 12])
                     }
                 }
                 .frame(minWidth: 100, minHeight: 100)

Sources/Keyboard/KeyboardKey.swift

@@ -109,16 +109,16 @@ public struct KeyboardKey: View {
         GeometryReader { proxy in
             ZStack(alignment: alignment) {
                 Rectangle()
-                    .foregroundColor(keyColor)
+                    .foregroundStyle(keyColor)
                     .padding(.top, topPadding(proxy.size))
                     .padding(.leading, leadingPadding(proxy.size))
-                    .cornerRadius(relativeCornerRadius(in: proxy.size))
+                    .clipShape(RoundedRectangle(cornerRadius: relativeCornerRadius(in: proxy.size)))
                     .padding(.top, negativeTopPadding(proxy.size))
                     .padding(.leading, negativeLeadingPadding(proxy.size))
                     .padding(.trailing, 0.5)
                 Text(text)
-                    .font(Font(.init(.system, size: relativeFontSize(in: proxy.size))))
-                    .foregroundColor(textColor)
+                    .font(.system(size: relativeFontSize(in: proxy.size)))
+                    .foregroundStyle(textColor)
                     .padding(relativeFontSize(in: proxy.size) / 3.0)
             }
         }