Fix somes invalid imports introduced in the previous commits.
Also support numpy v1 and v2 with a fallback import.

This probably changed with some python upgrade.

Since numpy 1.18 creating ragged arrays requires explit opt-in via
dtype-object [1].

Let's to that then.

[1]: numpy/numpy#14794

ic_electrodes was renamed to icephys_electrodes and the same for
add_ic_electrode/create_ic_electrode.

Since pynwb 1.1.0 the unit for stimuli are hardcoded, but supplying a
different one gives a warning. So let's just pass in the correct one.

[1]: NeurodataWithoutBorders/pynwb#1186 (comment)

The SweepTable was the first icephys table for grouping different patch
clamp series together, see NeurodataWithoutBorders/pynwb@21f91920 (Add a
SweepTable for icephys data, 2018-11-02) for pynwb 0.6.0.

This was superseeded by the icephys metadata tables introduced in pynwb
2.0.0 and finally removed in 3.0.0.

While migrating to the icephys metadata tables is on the list [1], we
don't want to do this here now.

So let's add a nasty hack for injecting a sweep table.

[1]: AllenInstitute/IPNWB#47

…bility

This is removed in python 3.12. And we can also directly use __version__.

… module

This is removed in python 3.12.

We can leverage the importlib.resources module introduced in python 3.9
instead.

…ackage

This is required for the python 3.14 CI job as not all packages ship
wheels.