fix(fang): incorrect \. regex

[fhightower]

I intended this regex to match \., but instead, it was matching \ followed by any character.

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (537ec0f) compared to base (ab8847f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #99   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           61        61           
=========================================
  Hits            61        61           

Impacted Files	Coverage Δ
ioc_fanger/regexes_fang.py	100.00% <ø> (ø)

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