fix: update changelog generation command for consistency

Refactor the changelog generation command in the CI configuration. 
Use consistent quotation marks in the command to enhance readability 
and avoid potential issues with shell parsing.

Release.gitlab-ci.yml

@@ -28,7 +28,7 @@ unbound_release_changelog:
   script:
   - 'echo "Generating changelog"'
   - 'git-cliff --bump --unreleased --strip header > CHANGES.md'
-  - "git-cliff --bump | sed 's/\s\+$//' > CHANGELOG.md"
+  - 'git-cliff --bump | sed "s/\s\+$//" > CHANGELOG.md'
   - 'echo "Bumping version"'
   - 'git-cliff --bumped-version 2>/dev/null > VERSION'
   artifacts: