Apple Releases New AirPods Pro 3 Firmware Update
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Apple today released a firmware update for the AirPods Pro 3. The latest firmware has a version number of 8B34, up from the previous version 8B30.

Apple has a support document for AirPods firmware updates, and it indicates that the 8B34 update contains unspecified "bug fixes and other improvements."
No other AirPods models received firmware updates today.
How to install AirPods Pro firmware updates, according to Apple:
AirPods Pro 3 were released in September, with key features versus the previous generation including increased active noise cancellation, improved sound quality, longer battery life per charge, heart rate monitoring during workouts, and more.
Source: Macrumors