fix: update type of user pool tags

[keetonian]

Issue #, if available:
#1453
Description of changes:

Description of how you validated changes:

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

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

[alexw91]

Codecov Report

Merging #1460 into develop will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1460   +/-   ##
========================================
  Coverage    94.36%   94.36%           
========================================
  Files           78       78           
  Lines         4685     4685           
  Branches       937      937           
========================================
  Hits          4421     4421           
  Misses         121      121           
  Partials       143      143           

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