adds typing extensions module dependency

Author: sufyankhanrao

requirements.txt

@@ -4,3 +4,4 @@ git+https://github.com/apimatic/core-interfaces-python@webhooks-support
 requests~=2.31
 setuptools>=68.0.0
 jsonpointer~=2.3
+typing-extensions~=4.15

setup.py

@@ -28,7 +28,8 @@
         'python-dateutil~=2.8',
         'requests~=2.31',
         'setuptools>=68.0.0',
-        'jsonpointer~=2.3'
+        'jsonpointer~=2.3',
+        'typing-extensions~=4.15'
     ],
     tests_require=[
         'pytest~=7.2.2',