fix: add endpoint for us-iso-*

[trivikr]

Similar to: #3064

Verified using AWS REPL:

aws-sdk> new AWS.S3({region: "us-iso-east-1"}).endpoint
Endpoint {
  protocol: 'https:',
  host: 's3.us-iso-east-1.c2s.ic.gov',
  port: 443,
  hostname: 's3.us-iso-east-1.c2s.ic.gov',
  pathname: '/',
  path: '/',
  href: 'https://s3.us-iso-east-1.c2s.ic.gov/'
}

Checklist

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

[codecov-io]

Codecov Report

Merging #3066 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3066   +/-   ##
=======================================
  Coverage   97.06%   97.06%           
=======================================
  Files         330      330           
  Lines        9528     9528           
  Branches     1749     1749           
=======================================
  Hits         9248     9248           
  Misses        280      280

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