Adds GitLab UI to buttons in Deploy TOkens

app/views/shared/deploy_tokens/_index.html.haml

@@ -3,7 +3,7 @@
 %section.qa-deploy-tokens-settings.settings.no-animate#js-deploy-tokens{ class: ('expanded' if expanded), data: { qa_selector: 'deploy_tokens_settings_content' } }
   .settings-header
     %h4= s_('DeployTokens|Deploy Tokens')
-    %button.btn.js-settings-toggle.qa-expand-deploy-keys{ type: 'button' }
+    %button.gl-button.btn.js-settings-toggle.qa-expand-deploy-keys{ type: 'button' }
       = expanded ? 'Collapse' : 'Expand'
     %p
       = description

changelogs/unreleased/ApplyGitLabUIbuttonstylestobuttonsindeploytokens_index-html-haml.yml

+---
+title: Update button style of expand/collapse button on Deploy Tokens page
+merge_request: 51077
+author: nuwe1
+type: other