chore: use RoundUpPowerOf2() in LockFreeQueue Init()

[ypingcn]

No description provided.

[github-actions]

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[ypingcn]

I have read the CLA Document and I hereby sign the CLA

[trpc-admin]

lgtm

[codecov]

Codecov Report

Merging #93 (a323f50) into main (a2acc4f) will decrease coverage by 0.10811%.
Report is 1 commits behind head on main.
The diff coverage is 100.00000%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main         #93         +/-   ##
===================================================
- Coverage   81.84292%   81.73481%   -0.10812%     
===================================================
  Files            855         855                 
  Lines          33805       33802          -3     
===================================================
- Hits           27667       27628         -39     
- Misses          6138        6174         +36     

Files	Coverage Δ
trpc/util/queue/lockfree_queue.h	100.00000% <100.00000%> (ø)

... and 8 files with indirect coverage changes