fix(deps): update dependency y-prosemirror to ^1.2.11 (stable29)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
y-prosemirror	^1.2.9 -> ^1.2.11

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Release Notes

yjs/y-prosemirror (y-prosemirror)

v1.2.11

Compare Source

• Fix duplication issue on concurrent insertion into empty nodes - closes #​160 #​161 627b6b2

v1.2.10

Compare Source

• removed another fix e8f03ab
• Merge pull request #​158 from tomasdahlqvist/master fd08cf3
• Removed reference to travis in readme ac5d5c5
• fix typo - yjs/y-prosemirror@58a73c1#commitcomment-143533102 19d8821
• disable cursor decoration when mapping is uninitialized - closes #​156 f41a3e1
• add initProseMirrorState info to readme 8f48d63

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