test: Mock dns.lookup on checkUrlForSsrf tests

[KevLehman]

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[dionisio-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.98%. Comparing base (2c72a26) to head (eeb6d31).

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@@           Coverage Diff            @@
##           develop   #32995   +/-   ##
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  Coverage    54.98%   54.98%           
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  Files         2596     2596           
  Lines        55970    55970           
  Branches     11584    11584           
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  Hits         30775    30775           
  Misses       22553    22553           
  Partials      2642     2642           

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unit	73.06% <ø> (ø)

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