datahub plugins must be installed with pydantic v1

[Ohad-upriver]

Hi,
As of this moment, when installing datahub with a plugin we must install it with pydantic v1.

In setup.py it is explain as follows:

pydantic_no_v2 = {
    # pydantic 2 makes major, backwards-incompatible changes - https://github.com/pydantic/pydantic/issues/4887
    # Tags sources that require the pydantic v2 API.
    "pydantic<2",
}

plugin_common = {
    # While pydantic v2 support is experimental, require that all plugins
    # continue to use v1. This will ensure that no ingestion recipes break.
    *pydantic_no_v2,
}

Does this mean you aren't planing to upgrade it at all?
The pydantic v2 isn't experimental anymore.