Getting Ready for 5.6.0 Release

[yuce]

• Set client version to 5.6.0
• Require Node.js 20 as the minimum. It's the currently minimum manintend Node,js LTS
• Fixed leaks with some socket callbacks
• Use clearTimeout for setTimeout instead of clearInterval.

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.42%. Comparing base (7ca2e69) to head (f093fdb).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/network/Connection.ts	88.23%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1571      +/-   ##
==========================================
- Coverage   93.43%   93.42%   -0.02%     
==========================================
  Files         466      466              
  Lines       16629    16644      +15     
  Branches     1351     1353       +2     
==========================================
+ Hits        15538    15550      +12     
- Misses        797      800       +3     
  Partials      294      294              

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