chore: update cliff.toml

Author: Xavier Berger

cliff.toml

@@ -19,7 +19,7 @@ body = """
 {% else %}\
     ## [unreleased]
 {% endif %}\
-{% for group, commits in commits | group_by(attribute="group") %}
+{% for group, commits in commits | filter(attribute="merge_commit", value=true) | group_by(attribute="group") %}
     #### {{ group | striptags | trim | upper_first }}
     {% for commit in commits | unique(attribute="message") %}
         - {% if commit.scope %}*({{ commit.scope }})* {% endif %}\