update package triggering security vulnerabilities warnings

[rawxfish]

• https://github.com/cardinalitypuzzles/smallboard/security/dependabot/yarn.lock/set-value/open
• https://github.com/cardinalitypuzzles/smallboard/security/dependabot/yarn.lock/immer/open

Smallboard still works for me locally after these upgrades.

[codecov[bot]]

Codecov Report

Merging #493 (301c4b7) into master (efceafd) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #493   +/-   ##
=======================================
  Coverage   87.44%   87.44%           
=======================================
  Files         111      111           
  Lines        2501     2501           
=======================================
  Hits         2187     2187           
  Misses        314      314           

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