How can I update Messenger without upgrading iOS?

it says i need to update my ios to 15.1 or later but i have storage problem and it will affect the apps i'm using, is there a way i can update app, and of course without needing to buy new phone. im using iphone 11,

and i don't want to update my ios

im satisfied with 14.5

[Re-Titled by Moderator]