Notistack Snackbar toast messages fail accessibility

[HRemonen]

The Notistack Snackbar alerts fails multiple success criterion:

1.4.3 (AA) Insufficient color contrast https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html

2.2.1 (AA) Users can complete tasks without unexpected changes in content or context that are a result of a time limit. https://www.w3.org/WAI/WCAG21/Understanding/timing-adjustable.html

2.2.3 (AAA) Timing is not an essential part of the event or activity presented by the content, except for non-interactive synchronized media and real-time events.

4.1.3 (AA) Users are aware of important changes in content that are not given focus, and to do so in a way that doesn't unnecessarily interrupt their work. https://www.w3.org/WAI/WCAG21/Understanding/status-messages.html