[python] fix eckit version for mir

[tmi]

Needed one extra fix, I put there wrong version of eckit in the deps

https://github.com/ecmwf/python-develop-bundle/actions/runs/27274546949 -- a successful build for all platforms

verified with

$ uv pip install 'pyyaml==3.11' setuptools # those are required by mir but are not on test pypi
$ uv pip install --prerelease allow -i https://test.pypi.org/simple/ mir-python==1.28.3.dev98
$ python
>>> import mir
>>>

(and unlike all previous attempts, this does not crash or complain)