fix: NSInvalidArgumentException when passing accessibilityIncrements (#682)

This fixes a NSInvalidArgumentException which causes a full app crash when `<Slider accessibilityIncrements={['anything non-empty array']} />` is rendered, by initializing an NSMutableArray instead of an NSArray, as it called with `addObject:` if `accessibilityIncrements` is non-empty.

Author: ckknight

package/ios/RNCSliderComponentView.mm

@@ -218,7 +218,7 @@ - (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &
         slider.accessibilityUnits = convertedAccessibilityUnits;
     }
     if (oldScreenProps.accessibilityIncrements != newScreenProps.accessibilityIncrements) {
-        id accessibilityIncrements = [NSArray new];
+        id accessibilityIncrements = [NSMutableArray new];
         for (auto str : newScreenProps.accessibilityIncrements) {
             [accessibilityIncrements addObject:[NSString stringWithUTF8String:str.c_str()]];
         }