gnome-shell: Fix buttons font-weight

Default theme made them bold in GNOME Shell 42.

Author: jnsh

common/gnome-shell/42/sass/_common.scss

@@ -57,6 +57,7 @@ stage {
   padding: 5px 32px;
   transition-duration: 0;
   border-radius: 2px;
+  font-weight: normal;
 
   @extend %button;
 }
@@ -265,6 +266,7 @@ StScrollBar {
     border-top-width: if($variant=='light', 0px, 1px);
     border-bottom-width: 0;
     border-right-width: 1px;
+    font-weight: normal !important;
 
     color: $osd_fg_color;
     background-color: $osd_bg_color;
@@ -2179,6 +2181,7 @@ $_dash_bottom_margin: 20px;
   .notification-button {
     padding: 4px 4px 5px;
     min-height: 0;
+    font-weight: normal !important;
     @extend %button;
 
     &:first-child, &:last-child { border-radius: 2px; }
@@ -2231,6 +2234,7 @@ $_dash_bottom_margin: 20px;
 
 .hotplug-notification-item {
   padding: 2px 10px;
+  font-weight: normal !important;
   @extend %button;
 
   &:focus { padding: 2px 10px; }