Fix input group text border color

Color was $gray-100 when it should be $gray-400.

Changelog: fixed

app/assets/stylesheets/framework/variables_overrides.scss

@@ -5,7 +5,7 @@
 
 $secondary: $gray-light;
 $input-disabled-bg: $gray-light;
-$input-border-color: $gray-100;
+$input-border-color: $gray-400;
 $input-color: $gl-text-color;
 $input-font-size: $gl-font-size;
 $font-family-sans-serif: $regular-font;

app/assets/stylesheets/startup/startup-dark.scss

@@ -140,7 +140,7 @@ h1 {
   color: #fafafa;
   background-color: #333;
   background-clip: padding-box;
-  border: 1px solid #404040;
+  border: 1px solid #868686;
   border-radius: 0.25rem;
 }
 @media (prefers-reduced-motion: reduce) {

app/assets/stylesheets/startup/startup-general.scss

@@ -121,7 +121,7 @@ h1 {
   color: #303030;
   background-color: #fff;
   background-clip: padding-box;
-  border: 1px solid #dbdbdb;
+  border: 1px solid #868686;
   border-radius: 0.25rem;
 }
 @media (prefers-reduced-motion: reduce) {

app/assets/stylesheets/startup/startup-signin.scss

@@ -189,7 +189,7 @@ hr {
   color: #303030;
   background-color: #fff;
   background-clip: padding-box;
-  border: 1px solid #dbdbdb;
+  border: 1px solid #868686;
   border-radius: 0.25rem;
 }
 @media (prefers-reduced-motion: reduce) {

ee/app/assets/stylesheets/startup/startup-dark.scss

@@ -140,7 +140,7 @@ h1 {
   color: #fafafa;
   background-color: #333;
   background-clip: padding-box;
-  border: 1px solid #404040;
+  border: 1px solid #868686;
   border-radius: 0.25rem;
 }
 @media (prefers-reduced-motion: reduce) {

ee/app/assets/stylesheets/startup/startup-general.scss

@@ -121,7 +121,7 @@ h1 {
   color: #303030;
   background-color: #fff;
   background-clip: padding-box;
-  border: 1px solid #dbdbdb;
+  border: 1px solid #868686;
   border-radius: 0.25rem;
 }
 @media (prefers-reduced-motion: reduce) {

ee/app/assets/stylesheets/startup/startup-signin.scss

@@ -189,7 +189,7 @@ hr {
   color: #303030;
   background-color: #fff;
   background-clip: padding-box;
-  border: 1px solid #dbdbdb;
+  border: 1px solid #868686;
   border-radius: 0.25rem;
 }
 @media (prefers-reduced-motion: reduce) {