Made chunked encoding HTTP header check stricter

[asvetlov]

No description provided.

[codecov]

Codecov Report

Merging #6305 (8ae8932) into master (33b630d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #6305   +/-   ##
=======================================
  Coverage   93.30%   93.30%           
=======================================
  Files         103      103           
  Lines       30362    30366    +4     
  Branches     2729     2730    +1     
=======================================
+ Hits        28328    28333    +5     
  Misses       1857     1857           
+ Partials      177      176    -1     

Flag	Coverage Δ
unit	93.22% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
aiohttp/http_parser.py	92.66% <100.00%> (+0.20%)	⬆️
tests/test_http_parser.py	99.06% <100.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.8: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.8/7f3251359b2ece0641acd0ccc5515dafaab5d8ed/pr-6305

Backported as #6306

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.9: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.9/7f3251359b2ece0641acd0ccc5515dafaab5d8ed/pr-6305

Backported as #6307

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.