chore: upgrade eslint to v9

[snitin315]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

fixes #5527

Motivation / Use-Case

#5527

Breaking Changes

No

Additional Info

Nothing

[codecov]

Codecov Report

❌ Patch coverage is 85.41667% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.52%. Comparing base (6afffac) to head (ffd10fa).
⚠️ Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
client-src/index.js	27.27%	7 Missing and 1 partial ⚠️
lib/Server.js	93.75%	3 Missing ⚠️
client-src/progress.js	50.00%	1 Missing and 1 partial ⚠️
client-src/overlay.js	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5535      +/-   ##
==========================================
+ Coverage   83.40%   83.52%   +0.11%     
==========================================
  Files          13       13              
  Lines        2031     2033       +2     
  Branches      749      749              
==========================================
+ Hits         1694     1698       +4     
+ Misses        303      301       -2     
  Partials       34       34              

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