fix: strip header of MR description

Release.gitlab-ci.yml

@@ -27,7 +27,7 @@ changelog:
     GIT_DEPTH: 0 # avoid shallow clone to give cliff all the info it needs
   script:
   - 'echo "Generating changelog"'
-  - 'git-cliff --bump --unreleased > CHANGES.md'
+  - 'git-cliff --bump --unreleased --strip header > CHANGES.md'
   - 'git-cliff --bump > CHANGELOG.md'
   - 'echo "Bumping version"'
   - 'git-cliff --bumped-version 2>/dev/null > VERSION'