fix(deps): update dependency yjs to ^13.6.21 (main)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
yjs (source)	^13.6.20 -> ^13.6.21

---

Release Notes

yjs/yjs (yjs)

v13.6.21

Compare Source

• fix #​657 - relative positions issue when using followUndoneDeletions=false f583d2a
• lint 1b0f2e5
• add nodejs specific tests 4404d09
• Merge pull request #​679 from hoangqwe159/main d4d4ae5
• Add PSPDFKit binding to README.md 4ffd370
• Merge pull request #​676 from himself65/patch-1 0419b74
• add Open Collaboration Tools as a user c951f2b
• docs: remove @toeverything/y-indexeddb 4e2d3c8
• update readme 8dc1296
• add stars to providers that sponsor yjs 4329997
• Merge pull request #​671 from carlossantos74/main 2b7ea8a
• add SuperViz Provider in yjs README 4f47355
• [funding.json] fix some validation issues 6074f80
• fix errors in funding.json 42bbb44
• add funding.json cc2d732
• add y-crdt elexir bindings e804dd7

---

Configuration

📅 Schedule: Branch creation - "every weekend" in timezone Europe/Berlin, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.59%. Comparing base (6702ab9) to head (7b9e1c4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6807      +/-   ##
==========================================
+ Coverage   46.56%   46.59%   +0.02%     
==========================================
  Files         748      733      -15     
  Lines       34307    34287      -20     
  Branches     1242     1227      -15     
==========================================
  Hits        15976    15976              
+ Misses      17709    17704       -5     
+ Partials      622      607      -15     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.