[CLOV-1901] Remove React 19.x upper cap in peer dependencies

[Ezreal Yang (Supremeyh)]

What

Widen the react and react-dom peer dependency range in packages/backpack-web/package.json from the pinned 18.3.1 - 19.2.5 to ^18.3.1 || ^19.0.0.

Why

The tight range was deliberately set during the React 19 migration to avoid install conflicts across repos while rolling out support. Now that migration is complete, the pin is no longer needed — and it breaks consumers on any React patch beyond 19.2.5 (e.g. 19.2.6).

Mirrors the same change already made to bpk-logos in bpk-logos#434.

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Remember to include the following changes:

• Ensure the PR title includes the name of the component you are changing so it's clear in the release notes for consumers of the changes in the version e.g [Clover-123][BpkButton] Updating the colour
• README.md (If you have created a new component)
• Component README.md
• Tests
• Accessibility tests
  • The following checks were performed:
    • Ability to navigate using a keyboard only
    • Zoom functionality (Deque University explanation):
      • The page SHOULD be functional AND readable when only the text is magnified to 200% of its initial size
      • Pages must reflow as zoom increases up to 400% so that content continues to be presented in only one column i.e. Content MUST NOT require scrolling in two directions (both vertically and horizontally)
    • Ability to navigate using a screen reader only
• Storybook examples created/updated
• For breaking changes or deprecating components/properties, migration guides added to the description of the PR. If the guide has large changes, consider creating a new Markdown page inside the component's docs folder and link it here

[Copilot]

Pull request overview

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Updates Backpack Web’s React peer dependency constraints to allow React 19 without an explicit upper patch cap.

Changes:

• Replace bounded React/ReactDOM peer dependency ranges with semver-compatible ranges covering React 18 and 19.

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[skyscanner-backpack-bot]

Visit https://backpack.github.io/storybook-prs/4972 to see this build running in a browser.