Update announcement_date for "Rename Task Runner pod to Toolbox"

data/deprecations/distribution_deprecations_14-3.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: "2021-09-22"
+  announcement_date: "2021-08-22"
   removal_milestone: "14.4" # 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).

doc/update/deprecations.md

@@ -64,4 +64,4 @@ The Task Runner pod is used to execute periodic housekeeping tasks within the Gi
 
 This will result in the rename of the sub-chart: `gitlab/task-runner` to `gitlab/toolbox`. Resulting pods will be named along the lines of `{{ .Release.Name }}-toolbox`, which will often be `gitlab-toolbox`. They will be locatable with the label `app=toolbox`.
 
-Announced: 2021-09-22
+Announced: 2021-08-22