Fix button font weights

[Droniu]

I want to merge this change because it:

• fixes default button font weight (should be bold)
• changes bold font weight to 600

Screenshots

Pull Request Checklist

• [ ] New components are exported from ./src/components/index.ts.
• [ ] The storybook story is created and documentation is properly generated.
• [ ] New component is wrapped in forwardRef.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 18d864475ec3d5eac72cefa0dd923d65acad5fe4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | @saleor/macaw-ui | Patch |

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Name	Status	Preview	Updated (UTC)
macaw-ui	✅ Ready (Inspect)	Visit Preview	Mar 18, 2024 1:12pm

[github-actions[bot]]

Released snapshot build with @dev tag in npm with version: 0.0.0-pr-20240318132510.

Install it with:

pnpm add @saleor/macaw-ui@0.0.0-pr-20240318132510