fix: add endpoint for us-isob-*

[trivikr]

add endpoint for us-isob-*
An update to IAM endpoint as done in #3056

Confirmed that region is set for IAM endpoint using AWS REPL

aws-sdk> let client = new AWS.S3({ "region": "us-isob-east-1" });

aws-sdk> let req = client.listBuckets();

aws-sdk> req.httpRequest.region
'us-isob-east-1'

Checklist

• npm run test passes
• changelog is added, npm run add-change

[codecov-io]

Codecov Report

Merging #3064 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3064   +/-   ##
=======================================
  Coverage   97.06%   97.06%           
=======================================
  Files         330      330           
  Lines        9528     9528           
  Branches     1749     1749           
=======================================
  Hits         9248     9248           
  Misses        280      280

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