fixes

src/rez/plugin_managers.py

@@ -5,6 +5,8 @@
 """
 Manages loading of all types of Rez plugins.
 """
+from __future__ import annotations
+
 from rez.config import config, expand_system_vars, _load_config_from_filepaths
 from rez.utils.formatting import columnise
 from rez.utils.schema import dict_to_schema

src/rez/solver.py

@@ -41,8 +41,6 @@
     from rez.package_order import PackageOrder
     from rez.version import Version
 
-from mypy_extensions import mypyc_attr
-
 
 T = TypeVar("T")