[8.x] Release concurrency lock for errors

[esbenp]

Currently the concurrency limiter will only release the lock if an exception is thrown in the block request. This PR will catch Throwable instead to release the lock when an Error occurs

[mfn]

Interesting. Maybe the code should be changed to not use tap but just release in a finally block? 🤔

Untested:

try {
  $callback();
} finally {
  $this->release($slot, $id);
}