fix: bump immutable to ^4.3.9 for CVE-2026-59879

[Jeevansuresh1]

Summary

• Bump immutable resolution from ^3.8.3 to ^4.3.9 (patched version for CVE-2026-59879)

Test plan

• yarn install succeeds
• yarn why immutable resolves to 4.3.9

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release-2.2@89bac25). Learn more about missing BASE report.

@@              Coverage Diff               @@
##             release-2.2     #680   +/-   ##
==============================================
  Coverage               ?   94.81%           
==============================================
  Files                  ?      227           
  Lines                  ?    13880           
  Branches               ?     3743           
==============================================
  Hits                   ?    13161           
  Misses                 ?      697           
  Partials               ?       22           

Flag	Coverage Δ
plugins	94.81% <ø> (?)

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