fix: publicPath is not reactive in dev restarting

[clarkdo]

Fix #5216

[codecov-io]

Codecov Report

Merging #5227 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #5227      +/-   ##
==========================================
+ Coverage   96.33%   96.33%   +<.01%     
==========================================
  Files          73       73              
  Lines        2483     2484       +1     
  Branches      631      632       +1     
==========================================
+ Hits         2392     2393       +1     
  Misses         76       76              
  Partials       15       15

Impacted Files	Coverage Δ
packages/server/src/middleware/modern.js	100% <100%> (ø)	⬆️

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