bench: refactor to use string interpolation in stats/base/snanvariancepn#10204

Planeshifter merged 1 commit intostdlib-js:developstdlib-js/stdlib:developfrom

shubham220420:shubham2204-snanvariancepnshubham220420/stdlib:shubham2204-snanvariancepnCopy head branch name to clipboard