FYSA: Apple 140W USB-C PSU may receive a firmware update

Morning all.

I just spotted this short note on Macworld:

If you own a 16-inch MacBook Pro, your power adapter just got its first-ever update

The key bit there is:

 Before you ask, no, we have no idea what it does. 
But we do know it brings the version number to 1.4.73 
and the build number to 10M5237. 

I checked the System Report (Apple icon > About this Mac > System Report) to see if my PSU had updated but apparently not.
The annotated screenshot below shows “steps to click or view in sequence” to get this info:

I own an M2-era Apple Macbook pro with official Apple 140W USB-C charger. All is fine with that combo BUT I have noticed this model of PSU emit an electric flash a lot more when inserted into a UK power socket (with or without load attached).
Doesn’t trip anything but I finally got some time to start digging…