IMHO, Avoiding another aircraft does not itself constitute a "near miss", and the terminology from a flight attendant may not always be the proper term.
One very safe and normal operation could be if your aircraft was established on final and traffic to the parallel runway started to slightly get off center line of their runway toward yours, a final monitor controller who is monitoring the final approach course determined your flight needed to climb and be vectored around for another approach in order to maintain the required separation between the two runways.
Another reason could be that your aircraft was overtaking the preceding and longitudinal separation would be lost if you continued the approach so your crew was instructed to climb and turn for re-sequencing.
There are a number of possible scenarios available.
Any views shared are strictly my own and do not a represent those of any former employer.