Deprecation warnings for dart-sass 3

[ankedsgn]

Hi! First, thank you for developing Poly-Fluid-Sizing.

Lately we've been getting deprecation warnings for some lines:

Deprecation Warning: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

Deprecation Warning: Sass's behavior for declarations that appear after nested
rules will be changing to match the behavior specified by CSS in an upcoming
version. To keep the existing behavior, move the declaration above the nested
rule. To opt into the new behavior, wrap the declaration in `& {}`.

Deprecation Warning: Global built-in functions are deprecated and will be removed in Dart Sass 3.0.0.
Use list.nth instead.

(the above is also given for list.length, map.keys, )

I don't know if you are still actively developing this repository, but could this be incorporated in a newer version? Thank you in advance!

[Cedric-ruiu]

Hello ! Same request :)