Dependencies: Relax version pinning for responder package

[amotl]

@kennethreitz picked up maintenance and released responder v3 GA, thank you!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.56%. Comparing base (1f864c9) to head (95332bc).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   82.56%   82.56%           
=======================================
  Files          12       12           
  Lines         218      218           
=======================================
  Hits          180      180           
  Misses         38       38           

Flag	Coverage Δ
unittests	82.56% <ø> (ø)

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