Update dependency responses to v0.25.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
responses (changelog)	==0.25.3 -> ==0.25.6

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Release Notes

getsentry/responses (responses)

v0.25.6

Compare Source

v0.25.5

Compare Source

• Fix readme issue that prevented 0.25.4 from being published to pypi.

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.67%. Comparing base (55c46b9) to head (f45d7c4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2091   +/-   ##
=======================================
  Coverage   85.67%   85.67%           
=======================================
  Files         120      120           
  Lines        5279     5279           
=======================================
  Hits         4523     4523           
  Misses        756      756           

Flag	Coverage Δ
unittests	85.67% <ø> (ø)

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