Fix error parsing the episode list of series for ABC AU

[rifuller]

IMPORTANT: PRs without the template will be CLOSED

Fix error parsing the episode list of series for ABC AU

ADD DESCRIPTION HERE

Fixes #

Template

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Copilot Summary

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Summary

🐛📺🆙

Fix playlist extraction for ABC iView show series. Update yt_dlp/extractor/abc.py to handle the new API format with nested items key.

videoEpisodes
Nested items hold the key
Bug fix for iView

Walkthrough

• Fix playlist extraction from ABC iView show series API response (link)

[bashonly]

Feel free to use this patch:

• ABC iView: TypeError: string indices must be integers, not 'str' (line 401) #8554 (comment)

since we want the extractor to work with both JSON structures.

And please add a test for a URL where the newly-supported structure is used

[rifuller]

If #8554 supersedes this, then this PR can be closed. Unfortunately, I can't work on this more at the moment because I'm overseas.