Unpin opm

[kwinkunks]

Pinned at <= 2022.4 to get tests to pass: #449

Seemed to be an issue with a keyword:

string = 'EQLDIMS\n 3 /\n\n\nGAS\nOIL\n\nEQUIL\n 2000 200 2200 1 2100 3 /\n 3000 200 2200 1 2100 3 /\n'
parsecontext = <opm.libopmcommon_python.ParseContext object at 0x7f23f48f3930>

    @staticmethod
    def str2deck(
        string: str, parsecontext: Optional[List[Tuple[str, Any]]] = None
    ) -> "opm.libopmcommon_python.Deck":
        """Produce a opm.io deck from a string, using permissive
        parsing by default"""
        if parsecontext is None:
            parsecontext = opm.io.ParseContext(OPMIOPARSER_RECOVERY)
>       return opm.io.Parser().parse_string(string, parsecontext)
E       RuntimeError: Problem with keyword EQUIL
E       In <memory string> line 8
E       Keyword is not properly terminated.

See https://github.com/equinor/ecl2df/actions/runs/5178051696/jobs/9328986782#step:10:199

[kvashchuka]

Closed with #477