Upgrade async-channel

[fafhrd91]

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[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (ea26d9e) 89.85% compared to head (a22129d) 89.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   89.85%   89.84%   -0.01%     
==========================================
  Files         189      189              
  Lines       31774    31784      +10     
==========================================
+ Hits        28549    28556       +7     
- Misses       3225     3228       +3     

Files	Coverage Δ
ntex-io/src/io.rs	86.27% <ø> (ø)
ntex-rt/src/arbiter.rs	92.76% <64.28%> (-1.46%)	⬇️

... and 1 file with indirect coverage changes

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