Support [tool.poetry] being used with PEP-621

`[tool.poetry]` section can co-exist with a PEP-621 styled project metadata to provide extra information. In `_pin_dependency` missing `name` and `version` keys inside a `poetry_config` raises `KeyError`s which aren't caught and leads to a fatal error.

poetry_monoranger_plugin/path_dep_pinner.py

@@ -132,7 +132,7 @@ def _pin_dependency(self, dependency: DirectoryDependency):
         try:
             name = cast(str, dep_pyproject.poetry_config["name"])
             version = cast(str, dep_pyproject.poetry_config["version"])
-        except PyProjectError:
+        except (PyProjectError, KeyError):
             # Fallback to the project section since Poetry V2 also supports PEP 621 pyproject.toml files
             name = cast(str, dep_pyproject.data["project"]["name"])
             version = cast(str, dep_pyproject.data["project"]["version"])