Merge pull request #16122 from mixxxdj/sync-branch-2.6-to-main

Merge changes from `2.6` into `main`

Author: ronso0

src/effects/backends/audiounit/audiounitmanager.mm

@@ -94,6 +94,7 @@
             qWarning() << "Could not instantiate Audio Unit"
                        << pManager->m_name << ":" << error
                        << "(Check https://www.osstatus.com for a description)";
+            dispatch_group_leave(pManager->m_instantiationGroup);
             return;
         }