strip Request mimetype

[jitka]

Strip valid commends to prevent

openapi_core.validation.response.exceptions.DataValidationError: DataValidationError: Content for the following mimetype not found: application/json; charset=utf-8. Valid mimetypes: ['application/json']"

[codecov]

Codecov Report

Merging #553 (a6f5082) into master (7456c4b) will not change coverage.
The diff coverage is n/a.

❗ Current head a6f5082 differs from pull request most recent head 218d07f. Consider uploading reports for the commit 218d07f to get more accurate results

@@           Coverage Diff           @@
##           master     #553   +/-   ##
=======================================
  Coverage   90.30%   90.30%           
=======================================
  Files         124      124           
  Lines        3681     3681           
  Branches      442      442           
=======================================
  Hits         3324     3324           
  Misses        302      302           
  Partials       55       55           

Impacted Files	Coverage Δ
openapi_core/contrib/requests/requests.py	88.23% <ø> (ø)

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[p1c2u]

Added test. LGTM

[p1c2u]

@jitka thank you for the contribution