build(deps-dev): revert electron upgrade from 19.0.8 to 20.0.1 in /app

[jkowalski]

This reverts commit 5fce956.

The app built with 20.0.1 fails to start on at least darwin/arm64, needs to be investigated.

[codecov]

Codecov Report

Base: 74.38% // Head: 74.42% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (edafb6b) compared to base (827bb70).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2423      +/-   ##
==========================================
+ Coverage   74.38%   74.42%   +0.04%     
==========================================
  Files         442      442              
  Lines       34969    34969              
==========================================
+ Hits        26010    26025      +15     
+ Misses       7059     7049      -10     
+ Partials     1900     1895       -5     

Impacted Files	Coverage Δ
internal/providervalidation/providervalidation.go	63.09% <0.00%> (-1.85%)	⬇️
internal/epoch/epoch_manager.go	84.81% <0.00%> (-0.49%)	⬇️
snapshot/snapshotfs/upload.go	85.01% <0.00%> (+1.10%)	⬆️
internal/server/source_manager.go	82.82% <0.00%> (+1.53%)	⬆️
cli/command_content_verify.go	81.03% <0.00%> (+6.03%)	⬆️

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