So I got an email from our hosting provider. We will be upgraded to php 8.1 on 7 April (tech spec for OMP just says greater than or equal to 7.3), nothing we can do about it short of switching hosting provider and running on a virtual server where we decide the php version. Does OMP 188.8.131.52 support OJS 8.1?
Sharing some recent reply from one of my colleagues about PHP compatibility matters (the specific issue is perhaps not so relevant, but the information/advice about PHP versions is):
OMP 3.4 is due out probably within the next month or so, so that might be a potential reason to consider upgrading as well.