chore: remove self.warm_up()

[ZanSara]

Related Issues

• fixes n/a

Proposed Changes:

• Update LocalWhisperTranscriber to not call warm_up() when transcribing to be coherent with all other Haystack 2.0 components.

How did you test it?

Local tests run

Notes for the reviewer

n/a

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 6001358886

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.002%) to 48.298%

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Totals
Change from base Build 6001109377:	-0.002%
Covered Lines:	11477
Relevant Lines:	23763

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💛 - Coveralls