build: Upgrade openai-whisper and re-introduce audio extra

[julian-risch]

Related Issues

The previous openai-whisper version pinned tiktoken causing a version conflict with Haystack's dependencies. The most recent openai-whisper version now unpins tiktoken, which resolves the conflict: https://github.com/openai/whisper/blob/v20231106/requirements.txt#L6

Proposed Changes:

• Upgrade openai-whisper to the latest version
• Re-introduce audio extra
• Install audio extra in workflows

How did you test it?

Still pending

Notes for the reviewer

I am still testing this and will report back here.

• Opened test: Add MetadataRouter to preprocessing pipeline in e2e test #6321 to fix an unrelated error in the e2e preview tests in a preprocessing pipeline

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 6889398688

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 23 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.004%) to 40.48%

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Files with Coverage Reduction	New Missed Lines	%
utils/scipy_utils.py	1	91.67%
nodes/audio/whisper_transcriber.py	22	25.97%

Totals
Change from base Build 6889380242:	-0.004%
Covered Lines:	10615
Relevant Lines:	26223

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💛 - Coveralls

[masci]

LGTM! 👍