Fix Not Equal

[FusionBolt]

1. replace != with !ReferenceEquals in CombineQuantizeConcat

[github-actions]

Test Results

5 859 tests  ±0   5 859 ✅ ±0   8m 27s ⏱️ ±0s
    6 suites ±0       0 💤 ±0 
    6 files   ±0       0 ❌ ±0 

Results for commit 252913f. ± Comparison against base commit ebac64a.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ebac64a) 72.88% compared to head (252913f) 72.88%.

Files	Patch %	Lines
src/Nncase.Passes/Rules/Neutral/CombineQuantize.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1156   +/-   ##
=======================================
  Coverage   72.88%   72.88%           
=======================================
  Files         706      706           
  Lines       25923    25923           
  Branches     4227     4227           
=======================================
  Hits        18895    18895           
  Misses       6384     6384           
  Partials      644      644           

Flag	Coverage Δ
integration	38.97% <0.00%> (ø)
unit	64.77% <0.00%> (ø)

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