fix(cloneDeepUnref): properly unwrap ref with undefined value

[DamianOsipiuk]

Closes: #125

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #126 (b8f92f0) into main (141cc84) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #126   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          266       266           
  Branches        51        51           
=========================================
  Hits           266       266           

Impacted Files	Coverage Δ
src/vue/utils.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 1.19.1 🎉

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