Select2 Bootstrap 5 Theme v1.2.0

• Fixed some testing & docs issues
• Fixed $s2bs5-disabled-color variable after a change in Bootstrap
• Updated Bootstrap package to allow for minor and patch updates automatically
• Fixed border styling on validated inputs #18
• Added a workflow to test compiling
• Replaced yarn with vanilla npm for further compatibility
• Replaced gulp-sass with gulp-dart-sass after node-sass was deprecated (subject to change)
• Improved the compiler
• Fixed double scroll issue on option groups #41
• Fixed some misnames variables and an instance of em #42
• Improved sizing styling to work with using .form-select-sm and .form-select-lg
• Set the z-index of the select2 dropdown to work with modals #50