hooks: update bokeh hook for bokeh >= 3.0.0

[rokm]

Starting with bokeh 3.0.0, the package sets its __version__ from metadata, so we need to collect it.

Oneshot before and after.

This one flew under our radar because although we have a hook for bokeh, we do not have an active test. And the panel test failing in the yesterday's weekly update PR is probably due to panel re-pinning required version of bokeh.

[bwoodsend]

I've been looking at why this one wasn't detected automatically by PyInstaller's bytecode scanning. Turns out that import importlib.metadata as importlib_metadata breaks it because _metadata_from() only searches for importlib.metadata.version when scanning modules importing importlib.metadata and for importlib_metadata.version when scanning modules importing importlib_metadata. It would have needed to search for importlib_metadata.version when a module imports importlib.metadata. I guess this is probably more fiddly to fix in PyInstaller.

[rokm]

I always forget that metadata should be picked up automatically...

One general limitation of the bytecode scanning is that we have no deal of tracking aliases back to their original names. In addition to importlib.metadata being imported as importlib_metadata, we currently also have no means of tracking version back to from importlib.metadata import version - which is annoying, because version could hypothetically as well be a local function with single string argument, so having _metadata_from pick up on just version might result in false positives...