Build of container image fails due to incombatible scancode-toolkit dependency

There is currently an issue with the scancode-toolkit dependency "normality" which now depends on pyicu. This means that it is currently not possible to build the container image for PurlDB.

Issues in scancode-toolkit:
https://github.com/aboutcode-org/scancode-toolkit/issues/4493

Workaround done in ScanCode.io:
https://github.com/aboutcode-org/scancode.io/pull/1796/files

It may make sense to implement a workaround like ScanCode.io did in the meantime until this is properly resolved for scancode-toolkit.