remove typing_extensions requirement

requirements.txt

@@ -1,5 +1,3 @@
-typing-extensions
-
 # testing
 pytest
 pylint

setup.py

@@ -52,6 +52,4 @@
       ],
 
       keywords='vfx visual effects file sequence frames image',
-
-      install_requires=['typing-extensions'],
       )

src/fileseq/filesequence.py

@@ -13,7 +13,6 @@
 import sys
 import typing
 from glob import iglob
-from typing_extensions import Self
 
 from . import constants, utils
 from .constants import (
@@ -148,7 +147,7 @@ def __init__(self,
                 for frame in self._frameSet
             ])
 
-    def copy(self) -> Self:
+    def copy(self) -> FileSequence:
         """
         Create a deep copy of this sequence
 
@@ -210,7 +209,7 @@ def _format(self, template):
             inverted=inverted,
             dirname=self.dirname())
 
-    def split(self) -> list[Self]:
+    def split(self) -> list[FileSequence]:
         """
         Split the :class:`FileSequence` into contiguous pieces and return them
         as a list of :class:`FileSequence` instances.