Gui: Use std::numeric_limits and std::numbers instead of defines

src/Gui/ShortcutManager.cpp

@@ -409,7 +409,7 @@ void ShortcutManager::onTimer()
     timer.stop();
 
     QAction *found = nullptr;
-    int priority = -INT_MAX;
+    int priority = -std::numeric_limits<int>::max();
     int seq_length = 0;
     for (const auto &info : pendingActions) {
         if (info.action) {