MongoDB 5.0 errores running unit tests (maybe something in STH implementation should be fixed?)

[fgalan]

Using MongoDB 5.0.4 some tests are failing:

  2255 passing (24s)
  9 failing

All them with this error message:

     MongoError: BSON field 'listCollections.nameOnly' is the wrong type 'int', expected type 'bool'

It should be investigated if this is a problem in unit tests only or if it actually affects to STH implementation.

(This issue is not important now, as we are using MongoDB 4.x versions, but important to note for the future)