Fix Python 3.14 compatibility issue

Removed unnecessary version check and simplified compatibility fix for Python 3.14 by directly importing ByteString from collections.abc and assigning it to typing.ByteString.

src/tzst/__init__.py

@@ -1,19 +1,15 @@
 """tzst - A Python library for creating and manipulating .tzst/.tar.zst archives."""
 
-import sys
-
 # Compatibility fix for Python 3.14 - ByteString was removed from typing
 # This is required for the zstandard library to work with Python 3.14+
-if sys.version_info >= (3, 14):
-    # ByteString was removed in Python 3.14, provide compatibility for zstandard
-    import typing
+import typing
 
-    try:
-        from collections.abc import ByteString
+try:
+    from collections.abc import ByteString
 
-        typing.ByteString = ByteString
-    except ImportError:
-        pass
+    typing.ByteString = ByteString
+except ImportError:
+    pass
 
 __version__ = "0.4.0"