Add deprecation notice to 14.4 release post and update 14.5 deprecation file

data/deprecations/14-2-deprecation-task-runner.yml

 - name: "Rename Task Runner pod to Toolbox" # The name of the feature to be deprecated
   announcement_milestone: "14.2" # The milestone when this feature was first announced as deprecated.
   announcement_date: "2021-08-22" # The date of the milestone release when this feature was first announced as deprecated
-  removal_milestone: "14.4" # The milestone when this feature is planned to be removed
+  removal_milestone: "14.5" # The milestone when this feature is planned to be removed
   body: | # Do not modify this line, instead modify the lines below.
     The Task Runner pod is used to execute periodic housekeeping tasks within the GitLab application and is often confused with the GitLab Runner. Thus, [Task Runner will be renamed to Toolbox](https://gitlab.com/groups/gitlab-org/charts/-/epics/25).
 

data/deprecations/15-0-deprecate-sles-12sp2.yml

+- name: "Deprecate support for SLES 12 SP2" # The name of the feature to be deprecated
+  announcement_milestone: "14.5" # The milestone when this feature was first announced as deprecated.
+  announcement_date: "2021-11-22"
+  removal_milestone: "15.0" # the milestone when this feature is planned to be removed
+  body: | # Do not modify this line, instead modify the lines below.
+    Long term service and support (LTSS) for SUSE Linux Enterprise Server (SLES) 12 SP2 [ended on March 31, 2021](https://www.suse.com/lifecycle/). The CA certificates on SP2 include the expired DST root certificate, and it's not getting new CA certificate package updates. We have implemented some [workarounds](https://gitlab.com/gitlab-org/gitlab-omnibus-builder/-/merge_requests/191), but we will not be able to continue to keep the build running properly.

doc/update/deprecations.md

@@ -36,7 +36,7 @@ For deprecation reviewers (Technical Writers only):
   https://about.gitlab.com/handbook/marketing/blog/release-posts/#update-the-deprecations-doc
 -->
 
-## 14.4
+## 14.5
 
 ### Rename Task Runner pod to Toolbox
 
@@ -94,6 +94,12 @@ In milestone 15.0, we will completely remove `Version` from `PackageType`.
 
 Announced: 2021-11-22
 
+### Deprecate support for SLES 12 SP2
+
+Long term service and support (LTSS) for SUSE Linux Enterprise Server (SLES) 12 SP2 [ended on March 31, 2021](https://www.suse.com/lifecycle/). The CA certificates on SP2 include the expired DST root certificate, and it's not getting new CA certificate package updates. We have implemented some [workarounds](https://gitlab.com/gitlab-org/gitlab-omnibus-builder/-/merge_requests/191), but we will not be able to continue to keep the build running properly.
+
+Announced: 2021-11-22
+
 ### GitLab Serverless
 
 [GitLab Serverless](https://docs.gitlab.com/ee/user/project/clusters/serverless/) is a feature set to support Knative-based serverless development with automatic deployments and monitoring.