Pins xsdata-ech to < 0.4.0

Version 0.4.0 contains the final V2 of eCH-0252 which breaks our import.

Author: treinhard

setup.cfg

@@ -180,7 +180,7 @@ install_requires =
     xlrd
     xlsxwriter!=3.2.4
     xsdata!=23.5
-    xsdata-ech
+    xsdata-ech<0.4.0
     yubico-client
     zope.sqlalchemy