fix(deps): update dependency y-prosemirror to ^1.2.5 (stable29)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
y-prosemirror	^1.0.20 -> ^1.2.5

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Release Notes

yjs/y-prosemirror (y-prosemirror)

v1.2.5

Compare Source

• upgrade typescript and fix destroy of old timeout 3c8a23b

v1.2.4

Compare Source

• add function to generate the initial doc for prosemirror 58a73c1
• Fix dataloss when plugins modify initial document - fixes ueberdosis/tiptap#5032 7b0a65c

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