Adjust crown alignment in the heading component

The crown was misaligned - it was lower than it should be in relation to
the text "GOV.UK". This corrects that alignment.

Also swaps out a `govuk-` class for a `gem-c-`class.

CHANGELOG.md

@@ -6,7 +6,11 @@
 - Don't include changes that are purely internal. The CHANGELOG should be a
   useful summary for people upgrading their application, not a replication
   of the commit log.
-
+
+## Unreleased
+
+* Fix misaligned crown in heading component ([PR #](https://github.com/alphagov/govuk_publishing_components/pull/))
+
 ## 24.13.5
 
 * Fix click tracking in government_navigation ([PR #2129](https://github.com/alphagov/govuk_publishing_components/pull/2129))

app/assets/stylesheets/govuk_publishing_components/components/_layout-header.scss

@@ -102,10 +102,14 @@
   }
 }
 
-.govuk-header__logotype {
+.gem-c-header__logotype {
   vertical-align: middle;
 }
 
+.gem-c-header__logotype-crown {
+  top: -2px;
+}
+
 .gem-c-header__product-name {
   display: none;
 

app/views/govuk_publishing_components/components/layout_header/_header_logo.html.erb

@@ -1,6 +1,6 @@
 <div class="govuk-header__logo gem-c-header__logo">
   <a href="<%= logo_link %>" class="govuk-header__link govuk-header__link--homepage" data-module="gem-track-click" data-track-category="homeLinkClicked" data-track-action="homeHeader">
-    <span class="govuk-header__logotype">
+    <span class="govuk-header__logotype gem-c-header__logotype">
       <svg aria-hidden="true" focusable="false" class="gem-c-header__logotype-crown govuk-header__logotype-crown" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 132 97" height="32" width="36">
         <path fill="currentColor" fill-rule="evenodd"
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