Maintenance: Changed search hook comment to match the current Ruby version again.

.gitlab-ci.yml

@@ -43,7 +43,7 @@ variables:
 # Cache gems in between jobs and pipelines
 # ATTENTION: We use a combination of the Ruby major and minor version number
 # as a key for the cache to avoid cache growth and incompatibilities between
-# the gems. Search hook: 2.7.2 (change it when updating the Ruby version too)
+# the gems. Search hook: 2.7.3 (change it when updating the Ruby version too)
 cache:
   key: "centos7ruby273"
   paths: