Upgrade EUI to 9.4.2

[chandlerprall]

Summary

9.4.2

Bug fixes

• Fixed hexToRgb from erroring on an incorrect string input (#1741)
• Fixed EuiBadge custom color prop type (#1741)
• Fixed inaccurately required onRefresh prop (should be optional) that was introduced in types in version 9.4.1 (#1743)

9.4.1

Bug fixes

• Adds missing type and fixes closure-scope problem for SuperDatePicker's onRefresh callback (#1732)
• Changed EuiBottomBar to refer to the end of document (#1727)
• Fixed EuiComboBox's calls to its onBlur prop (#1739)

Checklist

Use strikethroughs to remove checklist items you don't feel are applicable to this PR.

- [ ] This was checked for cross-browser compatibility, including a check against IE11
- [ ] Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
- [ ] Documentation was added for features that require explanation or tutorials
- [ ] Unit or functional tests were updated or added to match the most common scenarios
- [ ] This was checked for keyboard-only and screenreader accessibility

For maintainers

- [ ] This was checked for breaking API changes and was labeled appropriately
- [ ] This includes a feature addition or change that requires a release note and was labeled appropriately

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