fix - migrate division

[gbmeow]

sass-migrator division **/*.scss

In order to address:

DEPRECATION WARNING: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($si-default-marker-height, 2) or calc($si-default-marker-height / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

   ╷
72 │     margin-top: $si-default-marker-height / 2 - $si-default-marker-anchor-y;
   │                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    node_modules/snazzy-info-window/dist/snazzy-info-window.scss 72:17  @import
    styles/main.scss 105:9                                              root stylesheet

DEPRECATION WARNING: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($si-default-marker-height, 2) or calc($si-default-marker-height / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

   ╷
80 │     margin-top: $si-default-marker-height / 2 - $si-default-marker-anchor-y;
   │                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    node_modules/snazzy-info-window/dist/snazzy-info-window.scss 80:17  @import
    styles/main.scss 105:9                                              root stylesheet