Fix CodeActionTriggerKind enum access

[jwortmann]

A bug that was missed, resulting from importing the enum stdlib on Python 3.8 (compare #2446 (comment)).

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[predragnikolic]

A bug that was missed

I do not consider the current behavior a bug.

With the current main the server still receives the correct int.

I will merge this regardless,
because this PR makes the triggerKind easer to read in the LSP log panel.

[jwortmann]

You're right, technically the server communication wasn't affected by this, so maybe it's not a bug. I think I had earlier seen errors in the console about not being able to serialize the enums to JSON, but apparently it does still work and perhaps I remembered that wrong (or there was a different cause).