Clean up whitespace in whatsnew yamls

To get yamllint to start scanning these files,
we need to fix all the whitespace warnings
and errors

data/whats_new/202101140001_13_08.yml

@@ -80,4 +80,3 @@
   image_url: https://about.gitlab.com/images/home/kubernetes.png
   published_at: 2021-01-22
   release: 13.8
-

data/whats_new/202102180001_13_09.yml

@@ -120,4 +120,3 @@
   image_url: https://about.gitlab.com/images/13_9/deploy_keys.png
   published_at: 2021-02-22
   release: 13.9
-

data/whats_new/2021102000001_14_04.yml

@@ -57,4 +57,3 @@
   image_url: https://about.gitlab.com/images/14_4/monitor-integrated-error-tracking.png
   published_at: 2021-10-22
   release: 14.4
-

data/whats_new/202201200001_14_07.yml

@@ -39,4 +39,3 @@
   image_url: https://about.gitlab.com/images/14_7/group_access_token.png
   published_at: 2022-01-22
   release: 14.7
-

data/whats_new/202202210001_14_08.yml

@@ -89,4 +89,3 @@
   image_url: 'https://about.gitlab.com/images/14_8/rp_roadmap_settings.png'
   published_at: 2022-02-22
   release: 14.8
-  
\ No newline at end of file