fix: update ruamel.yaml usage to use supported APIs (#5517)

* fix: update pypi skeleton patch to use latest ruamel.yaml syntax

* Create 5517-fix-skeleton-patch.rst

* fix: encoding keyword no longer working

* fix: try this patch

* fix: use new syntax for ruamel.yaml

* doc: update changelog

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix: syntax error for yaml parser

* style: add back newline

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

conda_build/skeletons/pypi.py

@@ -121,7 +121,7 @@
 diff core.py core.py
 --- core.py
 +++ core.py
-@@ -166,5 +167,40 @@ def setup (**attrs):
+@@ -166,5 +167,42 @@ def setup (**attrs):
  \n
 +# ====== BEGIN CONDA SKELETON PYPI PATCH ======
 +
@@ -154,7 +154,9 @@
 +    data['classifiers'] = kwargs.get('classifiers', None)
 +    data['version'] = kwargs.get('version', '??PACKAGE-VERSION-UNKNOWN??')
 +    with io.open(os.path.join("{}", "pkginfo.yaml"), 'w', encoding='utf-8') as fn:
-+        fn.write(yaml.safe_dump(data, encoding=None))
++        _yaml = yaml.YAML(typ='safe', pure=True)
++        _yaml.encoding = None
++        _yaml.dump(data, fn)
 +
 +
 +# ======= END CONDA SKELETON PYPI PATCH ======

news/5517-fix-skeleton-patch.rst

@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Fixed ruamel.yaml usage to use supported APIs. (#5517)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>

tests/test_api_skeleton.py

@@ -485,7 +485,8 @@ def test_pypi_section_order_preserved(tmp_path: Path):
     ]
 
     # The loader below preserves the order of entries...
-    recipe = ruamel.yaml.load("\n".join(lines), Loader=ruamel.yaml.RoundTripLoader)
+    _yaml = ruamel.yaml.YAML(typ="rt")
+    recipe = _yaml.load("\n".join(lines))
 
     major_sections = list(recipe.keys())
     # Blank fields are omitted when skeletonizing, so prune any missing ones