fix(deps): update dependency yjs to ^13.6.15 (stable29)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
yjs (source)	^13.6.14 -> ^13.6.15

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Release Notes

yjs/yjs (yjs)

v13.6.15

Compare Source

• Merge pull request #​637 from synix/fix/readme-lint d56221b
• [relative-positions] add option to configure whether to follow redon insertions - #​638 ce43124
• fix: markdownlint readme error 0af69cf
• Merge pull request #​636 from fxsalazar/patch-1 927c236
• Add Hocuspocus as a backend provider 8270373
• add ourboard as user 5e712e3
• typo 4ffd23f
• Merge pull request #​630 from sakihet/fix-typo 05d974c
• fix typo f153277
• Merge pull request #​629 from synix/fix/outdated-y-instance aee9e14
• remove outdated Y instance in comments f5aa852
• Merge pull request #​627 from synix/fix/INTERNALS b990ad9
• fix: update search marker count in INTERNALS.md 43e1780
• Merge pull request #​626 from satyajeetjadhav/main 01c3668
• Update Readme who-is-using (thinkdeli.com) 52b9068
• add huly as a user d119459
• add synthesia as a user d730abe
• added more sponsors ca24f1e
• [readme] Added AppMaster to "Who is Using" dc45a8d
• add reference to y-redis 2062f52
• add y-webxdc - related to yjs/docs#55 6e674ff
• Add documentation & clarification to clone method #​622 2fba694
• add tinybase b235c57
• add tests for falsy formatting attributes - #​619 6beab79

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