Clean up more whitespace in deprecation yamls

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

data/deprecations/14-8-grpc-proxy.yml

@@ -2,7 +2,7 @@
   announcement_milestone: "14.8"  # The milestone when this feature was first announced as deprecated.
   announcement_date: "2022-02-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   removal_milestone: "15.0"  # The milestone when this feature is planned to be removed
-  removal_date: 2022-05-22 # The date of the milestone release when this feature is planned to be removed. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  removal_date: "2022-05-22"  # The date of the milestone release when this feature is planned to be removed. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   breaking_change: true  # If this deprecation is a breaking change, set this value to true
   reporter: jacobvosmaer-gitlab  # GitLab username of the person reporting the deprecation
   body: |  # Do not modify this line, instead modify the lines below.

data/deprecations/14-8-secure-ca-python-deprecation.yml

@@ -2,7 +2,7 @@
   announcement_milestone: "14.8"  # The milestone when this feature was first announced as deprecated.
   announcement_date: "2021-02-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   removal_milestone: "15.0"  # The milestone when this feature is planned to be removed
-  removal_date: 2021-05-22 # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  removal_date: "2021-05-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   breaking_change: true  # If this deprecation is a breaking change, set this value to true
   body: |  # Do not modify this line, instead modify the lines below.
     For those using Dependency Scanning for Python projects, we are deprecating the default `gemnasium-python:2` image which uses Python 3.6 as well as the custom `gemnasium-python:2-python-3.9` image which uses Python 3.9. The new default image as of GitLab 15.0 will be for Python 3.9 as it is a [supported version](https://endoflife.date/python) and 3.6 [is no longer supported](https://endoflife.date/python).

data/deprecations/15-0-oauth-noexpiry.yml

@@ -2,7 +2,7 @@
   announcement_milestone: "14.8"  # The milestone when this feature was first announced as deprecated.
   announcement_date: "2022-02-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   removal_milestone: "15.0"  # The milestone when this feature is planned to be removed
-  removal_date: 2022-05-22 # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  removal_date: "2022-05-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   breaking_change: true  # If this deprecation is a breaking change, set this value to true
   body: |  # Do not modify this line, instead modify the lines below.
     By default, all new applications expire access tokens after 2 hours. In GitLab 14.2 and earlier, OAuth access tokens

data/deprecations/15-0-oauth.yml

@@ -2,7 +2,7 @@
   announcement_milestone: "14.0"  # The milestone when this feature was first announced as deprecated.
   announcement_date: "2021-06-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   removal_milestone: "15.0"  # The milestone when this feature is planned to be removed
-  removal_date: 2022-05-22 # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  removal_date: "2022-05-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
   breaking_change: yes # If this deprecation is a breaking change, set this value to true
   body: |  # Do not modify this line, instead modify the lines below.
     The OAuth implicit grant authorization flow will be removed in our next major release, GitLab 15.0. Any applications that use OAuth implicit grant should switch to alternative [supported OAuth flows](https://docs.gitlab.com/ee/api/oauth2.html).