Merge branch '47773-search-bar' into 'master'

Resolve "Project search in navbar is missing top margin in dev.gitlab.com"

Closes #47773

See merge request gitlab-org/gitlab-ce!19718

app/assets/stylesheets/framework/header.scss

@@ -268,6 +268,8 @@
 
 .navbar-sub-nav,
 .navbar-nav {
+  align-items: center;
+
   > li {
     > a:hover,
     > a:focus {