Release 4.9.0

4.9.0 Release

What's Changed

• Add an icon-only variant to buttons by @sandhose in #189
• Set a default background color in storybook docs pages by @sandhose in #191
• InlineSpinner: fix forward ref by @florianduros in #190
• Inline the avatar mark to remove the react-dom/server dependency by @sandhose in #193
• Add label and destructive props to IconButton by @florianduros in #195

Full Changelog: v4.8.0...v4.9.0