bench: refactor to use dynamic memory allocation in `blas/ext/base/dsorthp` #25415

Job	Run time
Check for already resolved label	0s
Check for EditorConfig label	0s
Check for Git History label	0s
Check for spam label	0s
Check for contributor guidelines label	0s
Check for stale label	-6s
Check for project conventions label	-10s
	-16s

Provide feedback