[Bug] Templates containing non-US-ASCII characters fail to deploy in v2.3.1

[stumins]

Describe the bug
Templates containing non-US-ASCII characters (e.g. ©) cause the CFCT pipeline to fail at the Build stage due to fatal cfn-nag errors:

| FAIL FATAL|

| #<ArgumentError: invalid byte sequence in US-ASCII>
Failures count: 1
Warnings count: 0

WORKAROUNDS:

• Remove the special characters from your template.
• If this is not possible, update the buildspec for the Build stage of the CFCT pipeline and add the following flag to the dpkg-reconfigure

dpkg-reconfigure --frontend noninteractive

• Downgrade to CFCT v2.3.0

To Reproduce

• Commit a template with a non-US-ASCII character to your CFCT source repo/bucket

Expected behavior

• CFCT to handle all characters that are considered valid CloudFormation

Please complete the following information about the solution:

• This bug was introduced in CFCT v2.3.1
• This bug impacts deployments in all regions

[balltrev]

Release v2.4.0 addresses this regression.