Drop support for Python 2.

src/ifcopenshell-python/ifcopenshell/util/data.py

@@ -16,7 +16,6 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import annotations
 import numpy as np
 import ifcopenshell
 from typing import Any, Union

src/ifcopenshell-python/ifcopenshell/util/element.py

@@ -16,7 +16,6 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import annotations
 import ifcopenshell
 import ifcopenshell.util.element
 from typing import Any, Callable, Optional, Union, Literal, overload

src/ifcopenshell-python/ifcopenshell/util/pset.py

@@ -16,7 +16,6 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import annotations
 import re
 import pathlib
 import ifcopenshell