chore(core): bump version to 0.12.4

[dominic22]

Proposed Changes

[describe the changes here...]

Linked Issues

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Types of changes

What type of change does this pull request make (put an x in the boxes that apply)?

• [ ] Bug fix (non-breaking change that fixes an issue).
• [ ] New feature added (non-breaking change that adds functionality).
• [ ] Breaking change (fix or feature that would cause existing functionality to stop working as expected).
• [ ] Documentation update.
• [ ] Something else (e.g., tests, scripts, example, deployment, infrastructure).

Checklist

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• [ ] I have read the CONTRIBUTING guide
• [ ] Checks and tests pass locally

If applicable

• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked that code coverage does not decrease
• [ ] I have added/updated the documentation

Further comments

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