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A general description is here.
The bundled BLAS and LAPACK sources have been updated to those shipped with LAPACK 3.12.1.
This is mainly bug fixes, but includes a handful of new ancillary routines, including two new BLAS routines ‘dgemmtr’ and ‘zgemmtr’ which are now used by LAPACK routines. So an external BLAS to be used with the internal LAPACK (unusual) needs to provide those routines, and if an external LAPACK is 3.12.1 or later, the BLAS used must contain the 2025 additions.
There is a new ‘configure’ option ‘--with-2025blas’ which will compile the 2025 BLAS additions in the internal LAPACK to allow an external BLAS which lacks them to be used.