Tests broken (maybe openrpc changed?)

[BenediktBurger]

A test regarding openrpc fails (see https://github.com/pymeasure/pyleco/actions/runs/10473269206):

__________________ Test_discover_method.test_fail[RPCServer1] __________________

self = <test_rpc_server.Test_discover_method object at 0x7f83c6102040>
methods = [{'examples': [{'params': [{'name': 'arg', 'value': None}], 'result': {'value': {}}}], 'name': 'sem', 'params': [{'nam...ue, 'schema': {'title': 'Arg1', 'type': 'number'}}], 'result': {'name': 'result', 'schema': {'title': 'Result'}}, ...}]

    def test_fail(self, methods: list):
        m = methods[2]
        assert m["name"] == "fail"
>       assert m["description"] == fail.__doc__
E       KeyError: 'description'

tests/json_utils/test_rpc_server.py:167: KeyError

It only happens on Python >=3.9, suggesting, that it has to do with openrpc package (see #90 ).

[BenediktBurger]

In fact, openrpc changed treating a docstring as description to making summary be the first line of the docstring and the multi line description enters description.