fix fancy-collections

i made some mess with fancy-collections and overwriting releases on pypi.. i cleand up now yanked the releases and made a new bugfix release.

this MR just bumps requirement5s to the newest version.

requirements.txt

@@ -14,4 +14,4 @@ pandas==2.0.1
 scikit-learn==1.2.2
 scipy==1.10.1
 typing_extensions==4.5.0
-fancy-collections==0.2.0
+fancy-collections==0.2.1