refactor: replace sort package with slices for improved sorting performance

[Not-Dhananjay-Mishra]

Changes

• Replaced sort.Ints, sort.Slice, sort.Float64s and sort.Strings usage with slices.Sort and slices.SortFunc for sorting operations.

Improvement

• Adopted slices.Sort, which is the idiomatic approach in modern Go (introduced in Go 1.21).
• Reduced heap allocations due to more efficient implementation.
• Aligned with Go 1.22+ behavior, where sort.Ints internally delegates to slices.Sort (see https://pkg.go.dev/sort#Ints).
• Improved code readability and future compatibility with the standard library.

[fletcherw]

Thanks for the fix, this makes the code a little clearer and potentially faster which is great.