configuration_set on aws_cognito_user_pool always detected as a change

[Puneeth-n]

closes #20755

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Relates OR Closes #0000

Output from acceptance testing:

root@47307cab8cc7:/go/src/github.com/terraform-providers/terraform-provider-aws# TEST_AWS_SES_VERIFIED_EMAIL_ARN=arn:aws:ses:us-east-1:01234567890:identity/pn@foo.com make testacc ACCTEST_PARALLELISM=1 TESTARGS='-run=TestAccAWSCognitoUserPool_withEmailConfigurationSource'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 1 -run=TestAccAWSCognitoUserPool_withEmailConfigurationSource -timeout 180m
=== RUN   TestAccAWSCognitoUserPool_withEmailConfigurationSource
=== PAUSE TestAccAWSCognitoUserPool_withEmailConfigurationSource
=== CONT  TestAccAWSCognitoUserPool_withEmailConfigurationSource
--- PASS: TestAccAWSCognitoUserPool_withEmailConfigurationSource (46.56s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	46.716s
root@47307cab8cc7:/go/src/github.com/terraform-providers/terraform-provider-aws#

[Puneeth-n]

@teamterraform @breathingdust I re-ran the tests by setting up a test email identity :)

[ewbankkit]

LGTM 🚀.

[ewbankkit]

@Puneeth-n Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v3.59.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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