Pin typing-extensions to 4.7.1. (#109)

4.8.0 dropped support for Python 3.7 (https://github.com/python/typing_extensions/blob/main/CHANGELOG.md#release-480rc1-september-7-2023).

Author: tomaz-s1

TA_dataset/lib/requirements.txt

@@ -8,5 +8,5 @@ requests==2.31.0; python_version <= '3.8'
 sniffio==1.3.0; python_version <= '3.8'
 splunk-sdk==1.7.3; python_version <= '3.8'
 splunktaucclib==6.0.7; python_version <= '3.8'
-typing-extensions==4.9.0; python_version <= '3.8'
+typing-extensions==4.7.1; python_version <= '3.8'
 urllib3==1.26.16; python_version <= '3.8'