Remove fake changelog entries

Fake changelog entries were generated as part of testing our release
tooling with the 'main' branch. Now that the testing is done, this
commit removes such entries.

More info on https://gitlab.com/gitlab-com/gl-infra/delivery/-/issues/1441

CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
-## 42.1.1 (2021-02-12)
-
-- No changes.
-
 ## 13.8.4 (2021-02-11)
 ### Security (1 change)

CHANGELOG.md

@@ -2,14 +2,6 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
-## 42.1.1 (2021-02-12)
-
-### Security (2 changes)
-
-- Testing main branch.
-- Testing main branch.
-
-
 ## 13.8.4 (2021-02-11)
 ### Security (9 changes)