perf(middleware): reduce chain allocation

[tdakkota]

Benchstat:

name                old time/op    new time/op    delta
ChainMiddlewares-4    2.69µs ± 2%    1.29µs ± 2%  -52.01%  (p=0.000 n=13+15)

name                old alloc/op   new alloc/op   delta
ChainMiddlewares-4    1.57kB ± 0%    0.48kB ± 0%  -69.39%  (p=0.000 n=15+15)

name                old allocs/op  new allocs/op  delta
ChainMiddlewares-4      39.0 ± 0%      20.0 ± 0%  -48.72%  (p=0.000 n=15+15)

[codecov]

Codecov Report

Base: 72.66% // Head: 72.66% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (806922f) compared to base (f6f6b4d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #561   +/-   ##
=======================================
  Coverage   72.66%   72.66%           
=======================================
  Files         157      157           
  Lines       11082    11083    +1     
=======================================
+ Hits         8053     8054    +1     
  Misses       2609     2609           
  Partials      420      420           

Impacted Files	Coverage Δ
middleware/middleware.go	100.00% <100.00%> (ø)

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