lib: fix typo in QuicSessionStats

[SeokhunEom]

Corrects the misspelling of "privateSynbol" to "privateSymbol".

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.53%. Comparing base (b13f24c) to head (cb07081).

Files with missing lines	Patch %	Lines
lib/internal/quic/stats.js	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #60155   +/-   ##
=======================================
  Coverage   88.53%   88.53%           
=======================================
  Files         703      703           
  Lines      207997   207997           
  Branches    40015    40017    +2     
=======================================
+ Hits       184150   184160   +10     
+ Misses      15864    15860    -4     
+ Partials     7983     7977    -6     

Files with missing lines	Coverage Δ
lib/internal/quic/stats.js	95.31% <66.66%> (ø)

... and 25 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Hritikk999]

1 Failed, 20 successful checks