next.js

539ae6c1 - fix(output): do not slice pathname unless ends with `.txt` (#52640)

fix(output): do not slice pathname unless ends with `.txt` (#52640) ### What? When using `output: "export"`, all URL pathnames are sliced. ### Why? A regression was introduced at https://github.com/vercel/next.js/pull/50974/files#diff-7b6239af735eba0c401e1a0db1a04dd4575c19a031934f02d128cf3ac813757bR76-R80 ### How? Check if a pathname ends with `.txt` before slicing the end. Fixes #52381