chore(deps): update dependency prosemirror-model to v1.18.3

This MR contains the following updates:

Package	Type	Update	Change
prosemirror-model	resolutions	patch	1.18.1 -> 1.18.3

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Release Notes

prosemirror/prosemirror-model

v1.18.3

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Bug fixes

Copy all properties from the input spec to Schema.spec.

v1.18.2

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Bug fixes

Improve DOM parsing of nested block elements mixing block and inline children.

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