[Inline Notification]: close icon is invisible (white) when lowContract

[ZrianinaMariia]

What package(s) are you using?

• carbon-components 10.7.3
• carbon-components-react 7.7.3
• @carbon/icons-react 10.6.0

Detailed description

Describe in detail the issue you're having.

When I use inline notification with lowContract mode, close icon is almost not visible because it is white.

Is this issue related to a specific component?

Yes, ToastNotification

What did you expect to happen? What happened instead? What would you like to
see changed?

I expect to easily see close icon.

What browser are you working in?

Chrome Version 77.0.3865.120

What version of the Carbon Design System are you using?

10

What offering/product do you work on? Any pressing ship or release dates we
should be aware of?

Hyper Protect team, one of the services is going GA (end of November).

Steps to reproduce the issue

1. Just look at the Toast Notification component

Please create a reduced test case in CodeSandbox

https://codesandbox.io/s/codesandbox-516tr

Additional information

[asudoh]

Hi 👋 thank you for reporting! Addressed by: #4299

[ZrianinaMariia]

Thank you so much @asudoh!