f(ui): Fix font size for skip button in onboardingWizard (#22758)

src/sentry/static/sentry/app/components/onboardingWizard/task.tsx

@@ -218,6 +218,7 @@ const CTA = styled('div')`
 `;
 
 const SkipButton = styled(Button)`
+  font-size: ${p => p.theme.fontSizeMedium};
   color: ${p => p.theme.gray300};
 `;