fix: Increase indent of list items in yaml output

Signed-off-by: gardar <[email protected]>

src/antsibull_changelog/yaml.py

@@ -15,16 +15,21 @@
 import yaml
 
 _SafeLoader: Any
-_SafeDumper: Any
 try:
     # use C version if possible for speedup
-    from yaml import CSafeDumper as _SafeDumper
     from yaml import CSafeLoader as _SafeLoader
 except ImportError:
-    from yaml import SafeDumper as _SafeDumper
     from yaml import SafeLoader as _SafeLoader
 
 
+class _SafeDumper(yaml.SafeDumper):
+    """
+    Extend YAML dumper to increase indent of list items.
+    """
+    def increase_indent(self, flow=False, indentless=False):
+        return super().increase_indent(flow, False)
+
+
 def load_yaml(path: str) -> Any:
     """
     Load and parse YAML file ``path``.