fix(deps): update dependency y-prosemirror to ^1.2.9 (stable29)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
y-prosemirror	^1.2.5 -> ^1.2.9

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Release Notes

yjs/y-prosemirror (y-prosemirror)

v1.2.9

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• fix error when re-initializing ySync plugin with new view d09e05c
• prevent double destruction 1a540ed

v1.2.8

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• handle edge cases when pmview might not be defined in binding cfc56c5

v1.2.7

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• support initializing doc without forcing a synchronous reload 7c78c19

v1.2.6

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• allow supplying document updates as snapshots dd6e496
• Initial cursor position will be retained after y-pm sets the initial content - fixes #​126 a5a921a

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