Fix aws_host_utils_is_ipv6 function

[waahm7]

Description of changes:

• The host will always be stripped of [] and will never be enclosed in it.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.12%. Comparing base (24e2396) to head (8a280d6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1114      +/-   ##
==========================================
- Coverage   83.14%   83.12%   -0.03%     
==========================================
  Files          56       56              
  Lines        5760     5753       -7     
==========================================
- Hits         4789     4782       -7     
  Misses        971      971              

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