chore(modal): changeset

Author: stephl3

.changeset/modal-initial-focus-revert.md

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+---
+'@leafygreen-ui/modal': minor
+---
+
+[LG-5608](https://jira.mongodb.org/browse/LG-5608)
+
+In v20, the `initialFocus` prop was prematurely removed without proper migration paths. This change restores the prop with enhanced functionality and control. See more on [initial focus behavior](https://github.com/mongodb/leafygreen-ui/tree/main/packages/modal#initial-focus-behavior).