Stop fixing wiktextract's version to specific commit

requirements.txt

 pywikibot==8.3.2
 Flask==2.3.3
 flask_cors==4.0.0
-wiktextract @ git+https://github.com/tatuylonen/wiktextract.git@b0038bd7a8d7b7db1140060c1035a7bf3e659042
+wiktextract @ git+https://github.com/tatuylonen/wiktextract.git