Update empty states snapshots

Updates snapshots that were affected by the spacing fixes in
GlEmptyState.
https://gitlab.com/gitlab-org/gitlab-ui/-/releases/v28.11.2

ee/spec/frontend/security_dashboard/components/empty_states/__snapshots__/dashboard_has_no_vulnerabilities_spec.js.snap

@@ -11,7 +11,7 @@ exports[`dashboard has no vulnerabilities empty state matches snapshot 1`] = `
       <p>
         Although it's rare to have no vulnerabilities, it can happen. Check your settings to make sure you've set up your dashboard correctly.
       </p>
-      <div><a href=\\"/path/to/dashboard/documentation\\" class=\\"btn btn-success btn-md gl-button\\">
+      <div class=\\"gl-display-flex gl-flex-wrap gl-justify-content-center\\"><a href=\\"/path/to/dashboard/documentation\\" class=\\"btn gl-mb-3 btn-confirm btn-md gl-button gl-mx-2\\">
           <!---->
           <!----> <span class=\\"gl-button-text\\">Learn more about setting up your dashboard</span></a>
         <!---->

ee/spec/frontend_integration/security_dashboard/__snapshots__/first_class_init_integration_spec.js.snap

@@ -32,9 +32,11 @@ exports[`Vulnerability Report error states has unavailable pages 1`] = `
         <p>
           Either you don't have permission to view this dashboard or the dashboard has not been setup. Please check your permission settings with your administrator or check your dashboard configurations to proceed.
         </p>
-        <div>
+        <div
+          class="gl-display-flex gl-flex-wrap gl-justify-content-center"
+        >
           <a
-            class="btn btn-success btn-md gl-button"
+            class="btn gl-mb-3 btn-confirm btn-md gl-button gl-mx-2"
             href="/test/dashboard_page"
           >
             <span

ee/spec/frontend_integration/security_dashboard/__snapshots__/security_charts_init_integration_spec.js.snap

@@ -62,9 +62,11 @@ exports[`Security Charts error states has unavailable pages 1`] = `
         <p>
           Either you don't have permission to view this dashboard or the dashboard has not been setup. Please check your permission settings with your administrator or check your dashboard configurations to proceed.
         </p>
-        <div>
+        <div
+          class="gl-display-flex gl-flex-wrap gl-justify-content-center"
+        >
           <a
-            class="btn btn-success btn-md gl-button"
+            class="btn gl-mb-3 btn-confirm btn-md gl-button gl-mx-2"
             href="/test/dashboard_page"
           >
             <span

spec/frontend/packages/list/components/__snapshots__/packages_list_app_spec.js.snap

@@ -52,7 +52,9 @@ exports[`packages_list_app renders 1`] = `
              with GitLab.
           </p>
            
-          <div>
+          <div
+            class="gl-display-flex gl-flex-wrap gl-justify-content-center"
+          >
             <!---->
              
             <!---->

spec/frontend/serverless/components/__snapshots__/empty_state_spec.js.snap

@@ -10,8 +10,8 @@ exports[`EmptyStateComponent should render content 1`] = `
       <h1 class=\\"h4\\">Getting started with serverless</h1>
       <p>In order to start using functions as a service, you must first install Knative on your Kubernetes cluster. <gl-link-stub href=\\"/help\\">More information</gl-link-stub>
       </p>
-      <div>
-        <gl-button-stub category=\\"primary\\" variant=\\"success\\" size=\\"medium\\" icon=\\"\\" buttontextclasses=\\"\\" href=\\"/clusters\\">Install Knative</gl-button-stub>
+      <div class=\\"gl-display-flex gl-flex-wrap gl-justify-content-center\\">
+        <gl-button-stub category=\\"primary\\" variant=\\"confirm\\" size=\\"medium\\" icon=\\"\\" buttontextclasses=\\"\\" href=\\"/clusters\\" class=\\"gl-mb-3 gl-mx-2\\">Install Knative</gl-button-stub>
         <!---->
       </div>
     </div>