Migrate empty state button

ee/app/assets/javascripts/requirements/components/requirements_empty_state.vue

 <script>
-import { GlEmptyState, GlDeprecatedButton } from '@gitlab/ui';
+import { GlEmptyState, GlButton } from '@gitlab/ui';
 import { __ } from '~/locale';
 
 import { FilterState, FilterStateEmptyMessage } from '../constants';
@@ -7,7 +7,7 @@ import { FilterState, FilterStateEmptyMessage } from '../constants';
 export default {
   components: {
     GlEmptyState,
-    GlDeprecatedButton,
+    GlButton,
   },
   props: {
     filterBy: {
@@ -53,12 +53,9 @@ export default {
       :description="emptyStateDescription"
     >
       <template v-if="emptyStateDescription && canCreateRequirement" #actions>
-        <gl-deprecated-button
-          category="primary"
-          variant="success"
-          @click="$emit('clickNewRequirement')"
-          >{{ __('New requirement') }}</gl-deprecated-button
-        >
+        <gl-button category="primary" variant="success" @click="$emit('clickNewRequirement')">{{
+          __('New requirement')
+        }}</gl-button>
       </template>
     </gl-empty-state>
   </div>

ee/spec/frontend/requirements/components/requirements_empty_state_spec.js

 import { shallowMount } from '@vue/test-utils';
 
-import { GlEmptyState, GlDeprecatedButton } from '@gitlab/ui';
+import { GlEmptyState, GlButton } from '@gitlab/ui';
 import RequirementsEmptyState from 'ee/requirements/components/requirements_empty_state.vue';
 import { FilterState } from 'ee/requirements/constants';
 
@@ -106,7 +106,7 @@ describe('RequirementsEmptyState', () => {
     });
 
     it('renders new requirement button when project has no requirements', () => {
-      const newReqButton = wrapper.find(GlDeprecatedButton);
+      const newReqButton = wrapper.find(GlButton);
 
       expect(newReqButton.exists()).toBe(true);
       expect(newReqButton.text()).toBe('New requirement');
@@ -122,7 +122,7 @@ describe('RequirementsEmptyState', () => {
       });
 
       return wrapper.vm.$nextTick(() => {
-        const newReqButton = wrapper.find(GlDeprecatedButton);
+        const newReqButton = wrapper.find(GlButton);
 
         expect(newReqButton.exists()).toBe(false);
       });
@@ -134,7 +134,7 @@ describe('RequirementsEmptyState', () => {
       });
 
       return wrapper.vm.$nextTick(() => {
-        const newReqButton = wrapper.find(GlDeprecatedButton);
+        const newReqButton = wrapper.find(GlButton);
 
         expect(newReqButton.exists()).toBe(false);
       });