Remove requests_cache in tests

[silvanocerza]

Proposed Changes:

Remove caching of requests to huggingface.co when running tests to integration tests failures.
huggingface_hub already handles caching by itself as documented so this shouldn't affect our limits.

How did you test it?

I ran CI with PR #5282 to troubleshoot the issue, turns out that removing cache makes tests run correctly.

Notes for the reviewer

The failures weren't reproducible locally while running individual tests.
Failures examples: https://github.com/deepset-ai/haystack/actions/runs/5473396123

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 5474238866

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.005%) to 44.607%

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Files with Coverage Reduction	New Missed Lines	%
utils/context_matching.py	1	91.67%

Totals
Change from base Build 5473396123:	-0.005%
Covered Lines:	10265
Relevant Lines:	23012

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💛 - Coveralls