gnatcoll_iconv 23.0.0

We encountered an error during the generation of documentation:
<ExceptionDecl ["Unsupported_Conversion"] gnatcoll-iconv.ads:135:4-135:39>
<ExceptionDecl ["Invalid_Sequence_Error"] gnatcoll-iconv.ads:204:4-204:42>
<ExceptionDecl ["Incomplete_Sequence_Error"] gnatcoll-iconv.ads:205:4-205:42>

raised CONSTRAINT_ERROR : GNATdoc.Entities.Entity_Information_Maps.Constant_Reference: key not in map
ERROR: Command ["gnatdoc4", "-P", "iconv/gnatcoll_iconv.gpr", "--output-dir", "/home/chouteau/src/github/alire/docs.ada.dev/crate/gnatcoll_iconv/23.0.0", "--front-matter", "crate: gnatcoll_iconv", "--no-subprojects"] exited with code 1