Bump utils to improve plain text email formatting

Brings in:
- [x] https://github.com/alphagov/notifications-utils/pull/438
- [x] https://github.com/alphagov/notifications-utils/pull/450
- [x] https://github.com/alphagov/notifications-utils/pull/454

Changes:
- https://github.com/alphagov/notifications-utils/compare/25.3.0...26.2.0

tests/app/delivery/test_send_to_providers.py

@@ -117,7 +117,7 @@ def test_should_send_personalised_template_to_correct_email_provider_and_persist
         '"Sample service" <sample.service@test.notify.com>',
         'jo.smith@example.com',
         'Jo <em>some HTML</em>',
-        body='Hello Jo\nThis is an email from GOV.\u200bUK with <em>some HTML</em>',
+        body='Hello Jo\nThis is an email from GOV.\u200bUK with <em>some HTML</em>\n',
         html_body=ANY,
         reply_to_address=None
     )

tests/app/notifications/rest/test_send_notification.py

@@ -136,7 +136,7 @@ def test_send_notification_with_placeholders_replaced(notify_api, sample_email_t
                 queue="send-email-tasks"
             )
             assert response.status_code == 201
-            assert response_data['body'] == u'Hello Jo\nThis is an email from GOV.\u200BUK'
+            assert response_data['body'] == u'Hello Jo\nThis is an email from GOV.UK'
             assert response_data['subject'] == 'Jo'
 
 
@@ -148,7 +148,7 @@ def test_send_notification_with_placeholders_replaced(notify_api, sample_email_t
             '* Jo\n'
             '* John\n'
             '* Josephine\n'
-            'This is an email from GOV.\u200BUK'
+            'This is an email from GOV.UK'
         ),
         'Jo, John and Josephine',
     ),
@@ -156,7 +156,7 @@ def test_send_notification_with_placeholders_replaced(notify_api, sample_email_t
         6,
         (
             'Hello 6\n'
-            'This is an email from GOV.\u200BUK'
+            'This is an email from GOV.UK'
         ),
         '6',
     ),

tests/app/notifications/test_rest.py

@@ -579,7 +579,7 @@ def test_get_notification_by_id_returns_merged_template_content_for_email(
 
     notification = json.loads(response.get_data(as_text=True))['data']['notification']
     assert response.status_code == 200
-    assert notification['body'] == 'Hello world\nThis is an email from GOV.\u200BUK'
+    assert notification['body'] == 'Hello world\nThis is an email from GOV.UK'
     assert notification['subject'] == 'world'
     assert notification['content_char_count'] is None
 

tests/app/v2/notifications/test_get_notifications.py

@@ -120,7 +120,7 @@ def test_get_notification_by_id_with_placeholders_returns_200(
         'status': '{}'.format(sample_notification.status),
         'template': expected_template_response,
         'created_at': sample_notification.created_at.strftime(DATETIME_FORMAT),
-        'body': "Hello Bob\nThis is an email from GOV.\u200bUK",
+        'body': "Hello Bob\nThis is an email from GOV.UK",
         "subject": "Bob",
         'sent_at': sample_notification.sent_at,
         'completed_at': sample_notification.completed_at(),

tests/app/v2/notifications/test_post_notifications.py

@@ -313,7 +313,7 @@ def test_post_email_notification_returns_201(client, sample_email_template_with_
     assert notification.reference is None
     assert notification.reply_to_text is None
     assert resp_json['content']['body'] == sample_email_template_with_placeholders.content \
-        .replace('((name))', 'Bob').replace('GOV.UK', u'GOV.\u200bUK')
+        .replace('((name))', 'Bob')
     assert resp_json['content']['subject'] == sample_email_template_with_placeholders.subject \
         .replace('((name))', 'Bob')
     assert resp_json['content']['from_email'] == "{}@{}".format(