Force a string true in the update_shared_storages to match the expectations of _mount_unmount

[dreambeyondorange]

… in the efs resource

Updates to a cluster result in boolean values for the iam_authorization and efs_encryption_in_transit objects.

Tests

• Tested the change locally with an update to a cluster with an EFS fs with encryption in transit. Adding the boolean check allows the cookbook to use TLS for the fs.

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.48%. Comparing base (7d414fe) to head (6594f79).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2691   +/-   ##
========================================
  Coverage    76.48%   76.48%           
========================================
  Files           22       22           
  Lines         2220     2220           
========================================
  Hits          1698     1698           
  Misses         522      522           

Flag	Coverage Δ
unittests	76.48% <ø> (ø)

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