perf: fix very small memory leaks

src/logic/events/KeyboardEvents.swift

@@ -18,9 +18,10 @@ class KeyboardEvents {
     static var eventHotKeyRefs = [EventHotKeyRef?](repeating: nil, count: globalShortcuts.count)
     static var hotModifierEventHandler: EventHandlerRef?
     static var hotKeyEventHandler: EventHandlerRef?
+    static var localMonitor: Any?
 
     static func observe() {
-        NSEvent.addLocalMonitorForEvents(matching: [.keyDown, .flagsChanged]) { event in
+        localMonitor = NSEvent.addLocalMonitorForEvents(matching: [.keyDown, .flagsChanged]) { event in
             // global .flagsChanged events are not send to the app when it's active, thus modifiers-only shortcuts should be matched in global and local handlers
             if handleHotModifier(cocoaToCarbonFlags(event.modifierFlags)) || handleLocalEvents(event) {
                 return nil // don't propagate event

src/logic/events/MouseEvents.swift

@@ -29,7 +29,7 @@ private func observe_() {
         callback: mouseHandler,
         userInfo: nil)
     MouseEvents.toggle(false)
-    let runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0)
+    let runLoopSource = CFMachPortCreateRunLoopSource(nil, eventTap, 0)
     CFRunLoopAddSource(BackgroundWork.mouseEventsThread.runLoop, runLoopSource, .commonModes)
 }
 
@@ -48,7 +48,7 @@ private func mouseHandler(proxy: CGEventTapProxy, type: CGEventType, cgEvent: CG
     } else if (type == .tapDisabledByUserInput || type == .tapDisabledByTimeout) && shouldBeEnabled {
         CGEvent.tapEnable(tap: eventTap!, enable: true)
     }
-    return Unmanaged.passRetained(cgEvent) // focused app will receive the event
+    return Unmanaged.passUnretained(cgEvent) // focused app will receive the event
 }
 
 private func isPointerInsideUi_() {