chore(gitlab): fix typo

Author: Xeryus Stokkel

.gitlab-ci.yml

@@ -251,8 +251,8 @@ pip-centos-8-master-py3: {extends: '.test_instance'}
 pip-opensuse-leap-153-master-py3: {extends: '.test_instance'}
 pip-opensuse-leap-152-master-py3: {extends: '.test_instance'}
 pip-arch-base-latest-master-py3: {extends: '.test_instance'}
-pip-gentoo-stage-3-latest-master-py3: {extends: '.test_instance'}
-pip-gentoo-stage-3-systemd-master-py3: {extends: '.test_instance'}
+pip-gentoo-stage3-latest-master-py3: {extends: '.test_instance'}
+pip-gentoo-stage3-systemd-master-py3: {extends: '.test_instance'}
 
 ###############################################################################
 # `release` stage: `semantic-release`