fix pip version: can't install fairseq

[keitarou]

Pull request checklist

• [ ] The PR has a proper title. Use Semantic Commit Messages. (No more branch-name title please)

• [ ] Make sure this is ready to be merged into the relevant branch. Please don't create a PR and let it hang for a few days.

• [ ] Ensure you can run the codes you submitted succesfully. These submissions will be prioritized for review:

  Introduce improvements in program execution speed;

  Introduce improvements in synthesis quality;

  Fix existing bugs reported by user feedback (or you met);

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PR type

• Bug fix

Description

21.17 Please use pip<24.1 if you need to use this version.
21.18   Downloading omegaconf-2.0.5-py3-none-any.whl.metadata (3.0 kB)
21.18 WARNING: Ignoring version 2.0.5 of omegaconf since it has invalid metadata:
21.18 Requested omegaconf<2.1 from https://files.pythonhosted.org/packages/e5/f6/043b6d255dd6fbf2025110cea35b87f4c5100a181681d8eab496269f0d5b/omegaconf-2.0.5-py3-none-any.whl (from fairseq==0.12.2->-r requirements.txt (line 7)) has invalid metadata: .* suffix can only be used with `==` or `!=` operators
21.18     PyYAML (>=5.1.*)
21.18             ~~~~~~^
21.18 Please use pip<24.1 if you need to use this version.
21.18 INFO: pip is looking at multiple versions of hydra-core to determine which version is compatible with other requirements. This could take a while.
21.18 ERROR: Cannot install -r requirements.txt (line 7) and fairseq because these package versions have conflicting dependencies.
21.18
21.18 The conflict is caused by:
21.18     fairseq 0.12.2 depends on omegaconf<2.1
21.18     hydra-core 1.0.7 depends on omegaconf<2.1 and >=2.0.5
21.18
21.18 To fix this you could try to:
21.18 1. loosen the range of package versions you've specified
21.18 2. remove package versions to allow pip to attempt to solve the dependency conflict
21.18
21.25 ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
------
failed to solve: process "/bin/sh -c pip install --no-cache-dir -r requirements.txt" did not complete successfully: exit code: 1

https://github.com/RVC-Project/Retrieval-based-Voice-Conversion-WebUI/issues/2225

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