Add font weight options for form controls and custom select (#27343)

scss/_custom-forms.scss

@@ -166,6 +166,7 @@
   width: 100%;
   height: $custom-select-height;
   padding: $custom-select-padding-y ($custom-select-padding-x + $custom-select-indicator-padding) $custom-select-padding-y $custom-select-padding-x;
+  font-weight: $custom-select-font-weight;
   line-height: $custom-select-line-height;
   color: $custom-select-color;
   vertical-align: middle;
@@ -279,6 +280,7 @@
   z-index: 1;
   height: $custom-file-height;
   padding: $custom-file-padding-y $custom-file-padding-x;
+  font-weight: $custom-file-font-weight;
   line-height: $custom-file-line-height;
   color: $custom-file-color;
   background-color: $custom-file-bg;

scss/_forms.scss

@@ -10,6 +10,7 @@
   height: $input-height;
   padding: $input-padding-y $input-padding-x;
   font-size: $font-size-base;
+  font-weight: $input-font-weight;
   line-height: $input-line-height;
   color: $input-color;
   background-color: $input-bg;

scss/_variables.scss

@@ -426,6 +426,7 @@ $label-margin-bottom:                   .5rem !default;
 $input-padding-y:                       $input-btn-padding-y !default;
 $input-padding-x:                       $input-btn-padding-x !default;
 $input-font-size:                       $input-btn-font-size !default;
+$input-font-weight:                     $font-weight-base !default;
 $input-line-height:                     $input-btn-line-height !default;
 
 $input-padding-y-sm:                    $input-btn-padding-y-sm !default;
@@ -526,6 +527,7 @@ $custom-select-padding-y:           .375rem !default;
 $custom-select-padding-x:           .75rem !default;
 $custom-select-height:              $input-height !default;
 $custom-select-indicator-padding:   1rem !default; // Extra padding to account for the presence of the background-image based indicator
+$custom-select-font-weight:         $input-font-weight !default;
 $custom-select-line-height:         $input-line-height !default;
 $custom-select-color:               $input-color !default;
 $custom-select-disabled-color:      $gray-600 !default;
@@ -582,6 +584,7 @@ $custom-file-disabled-bg:           $input-disabled-bg !default;
 $custom-file-padding-y:             $input-padding-y !default;
 $custom-file-padding-x:             $input-padding-x !default;
 $custom-file-line-height:           $input-line-height !default;
+$custom-file-font-weight:           $input-font-weight !default;
 $custom-file-color:                 $input-color !default;
 $custom-file-bg:                    $input-bg !default;
 $custom-file-border-width:          $input-border-width !default;