fix: use early ttl with early cache in etag middleware

[Krukov]

fix #202

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 93.78%. Comparing base (bf31f06) to head (ed3b749).

Files	Patch %	Lines
cashews/contrib/fastapi.py	70.00%	2 Missing and 4 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
- Coverage   94.08%   93.78%   -0.30%     
==========================================
  Files          54       54              
  Lines        3483     3493      +10     
  Branches      602      605       +3     
==========================================
- Hits         3277     3276       -1     
- Misses        101      108       +7     
- Partials      105      109       +4     

Flag	Coverage Δ
unittests	93.67% <65.00%> (-0.30%)	⬇️

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