Fix ConcurrentModificationException (#3691)

## Description

Currently in `NativeDetector` on `android` we have:

```kt
  fun onViewDrop() {
    val registry = RNGestureHandlerModule.registries[moduleId]
      ?: throw Exception("Tried to access a non-existent registry")

    for (tag in attachedHandlers) {
      registry.detachHandler(tag)
      attachedHandlers.remove(tag)
    }
  }
```

Under some circumstances (I've managed to reproduce it on my branch with gesture relations) it fails with `ConcurrentModificationException`

## Test plan

I'll update when I push my branch to remote.

<details>
<summary>Tested on the following code:</summary>

```ts
import * as React from 'react';
import { Animated, Button, useAnimatedValue } from 'react-native';
import {
  GestureHandlerRootView,
  NativeDetector,
  useSimultaneous,
  useGesture,
  useExclusive,
  useRace,
} from 'react-native-gesture-handler';

export default function App() {
  const [visible, setVisible] = React.useState(true);

  const value = useAnimatedValue(0);
  const event = Animated.event(
    [{ nativeEvent: { handlerData: { translationX: value } } }],
    {
      useNativeDriver: true,
    }
  );

  const tap1 = useGesture('TapGestureHandler', {
    onEnd: () => {
      'worklet';
      console.log('Tap 1');
    },
    numberOfTaps: 1,
  });
  const tap2 = useGesture('TapGestureHandler', {
    onEnd: () => {
      'worklet';
      console.log('Tap 2');
    },
    numberOfTaps: 2,
  });

  const pan1 = useGesture('PanGestureHandler', {
    onUpdate: (e) => {
      'worklet';
      console.log('Pan 1');
    },
  });

  const pan2 = useGesture('PanGestureHandler', {
    onUpdate: (e) => {
      'worklet';
      console.log('Pan 2');
    },
  });

  // const composedGesture = useExclusive(tap2, tap1);
  const composedGesture = useRace(pan1, pan2);
  // const composedGesture = useExclusive(tap1, useSimultaneous(pan1, pan2));

  return (
    <GestureHandlerRootView
      style={{ flex: 1, backgroundColor: 'white', paddingTop: 8 }}>
      <Button
        title="Toggle visibility"
        onPress={() => {
          setVisible(!visible);
        }}
      />

      {visible && (
        <NativeDetector gesture={composedGesture}>
          <Animated.View
            style={[
              {
                width: 150,
                height: 150,
                backgroundColor: 'blue',
                opacity: 0.5,
                borderWidth: 10,
                borderColor: 'green',
                marginTop: 20,
                marginLeft: 40,
              },
              { transform: [{ translateX: value }] },
            ]}
          />
        </NativeDetector>
      )}
    </GestureHandlerRootView>
  );
}
```

</details>

Author: m-bert

packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerDetectorView.kt

@@ -128,7 +128,7 @@ class RNGestureHandlerDetectorView(context: Context) : ReactViewGroup(context) {
     val registry = RNGestureHandlerModule.registries[moduleId]
       ?: throw Exception("Tried to access a non-existent registry")
 
-    for (tag in attachedHandlers) {
+    for (tag in attachedHandlers.toMutableSet()) {
       registry.detachHandler(tag)
       attachedHandlers.remove(tag)
     }