v9.1.0
[material-ui][docs] Fix sentence in the All components page (#42336)
[transitions] Support `prefers-reduced-motion` (#48357)
[docs] Remove redundant enhanceHighContrast information (#48632)
[docs-infra] Test HTML validation in broken links checker (#48088)
[docs] Fix HTML validation errors (#48107)
[docs] Improve CSP guide with required directives (#48258)
Eslint markdown (#48371)
[docs] Fix versions page (#48261)
[core] Remove GridLegacy component (#47956)