Error after upgrade to "Bootstrap 5.2.3"

[lucaspontarolo]

After upgrade bootstrap to version 5.2.3 I got the following error, any suggestions to fix it?

Error: argument `$color2` of `mix($color1, $color2, $weight: 50%)` must be a color
        on line 212:11 of node_modules/bootstrap/scss/_functions.scss, in function `mix`
        from line 212:11 of node_modules/bootstrap/scss/_functions.scss, in function `shade-color`
        from line 78:138 of node_modules/select2-bootstrap-5-theme/src/_variables.scss
        from line 1:9 of node_modules/select2-bootstrap-5-theme/src/_include-all.scss

[f1mishutka]

See issue #75 for possible solution.