Bump the plugin version to 4.6

[youknowriad]

Changelog

• Fix issue with drag-and-drop in columns.
• Fix TinyMCE list plugin registration.
• Fix IE11 flexbox alignment when min-width is set.
• Fix IE11 focus loss after TinyMCE init. Add IE check.
• Fix getSelectedBlockClientId selector.
• Fix issue where unregistering a block type would cause blocks that convert to it to break.
• Fix Classic block not showing galleries on a grid.
• Fix visual issues with Button block text wrap.
• Fix modals in Edge.
• Fix Categories block filter effect on the front-end.
• Fix an issue where the block toolbar would cause an image to jump downwards when the wide or full - alignments were activated.
• Apply IE11 input fix only when mounting TinyMCE.
• Improve block preview styling.
• Make the Image Link URL field readonly.
• Disable HTML edit from Media & Text block.
• Avoid loading theme editor styles if not existing (RTL languages).
• Improve scoping of nested paragraph right-padding CSS rule.
• Add e2e tests for the format API.
• Merge similar text strings for i18n.
• Move editor specific styles from style.scss to editor.scss in Cover block.
• Simplify sidebar tabs aria-labels.
• Remove onSplit from RichText docs.
• Remove textdomain from the block library.
• Avoid rendering AdminNotices compatibility component.
• Avoid changing default wpautop priority.
• Change @Package names to WordPress.
• Update published packages changelogs.