Replace nonexistent std.sort.sort with std.mem.sort

[Tyrubias]

The pull request ziglang/zig#15412 changes the sorting functions built into Zig and as a result std.sort.sort doesn't exist anymore. This pull request changes usages of std.sort.sort to std.mem.sort which is consistent with the changes made in the standard library to change std.sort.sort to std.mem.sort. Currently, std.mem.sort calls std.sort.block, which is an stable in-place sort with $O(n)$ best case, $O(n\log(n))$ worst case, and $O(n\log(n))$ average case time complexity. The block sort also has $O(1)$ memory usage.

[leecannon]

Just waiting for the zig tarballs to update with this change.

[leecannon]

CI is failing due to #1199
But local tests are passing.